From Tokyopop: Nanaki survives a car accident to discover he is psychic. Recruited into an organization that solves cases with psychic powers, Nanaki's average life quickly turns into one of adventure and intrigue. Slacker Nanaki Shunsuke's life is turned upside down when he's hit by a bank robber's car and later meets a strange boy who claims that the accident caused Nanaki to develop psychic powers and that he is required to join LOCK, a paranormal investigations agency or be the suspect of any and every suspicious case that turns up. (thought a summary and categories were need since there weren't any :P If your into Shonen it's a good read :P Sirenic Griffin){Corrections by Silvermagic}

This manga takes place in a school where the students are based on famous shoguns in Japanese history. Sengoku Gakuen was once like a normal school but Oda Nobunaga, the student president overthrew the teachers and practically made them powerless. He built a school of the students, for the students and by the students. Nobunaga eventually graduated and left Hideyoshi in charge as the student president. However, Hideyoshi soon drops out of school to help Nobunaga rule Japan as he ruled Sengoku Gakuen. The story picks up here as there is a battle between Ishida Mitsunari, an uptight and conservative, yet hardworking boy, and Tokugawa Ieyasu, the temporary school president who has lots of followers, fighting for the school president seat. We also see other famous figures as fellow students such as Ootani Yoshitsugu who is loyally following Mitsunari and Oichi, Nobunaga�™s younger sister. Who will win the student body president position and take command of the school?

?Onegai Twins? is a cute, incestuous love story between a boy and two girls who are supposedly his long-lost twin sisters. The story follows Maiku, Karen, and Miina. Maiku is a high school boy orphaned at an early age, now living in a house he believes is the house he grew up in. Onegai Twins! is the sequel spin-off to Onegai Teacher!

From Broccoli:
When Kaya runs into trouble one day, it’s not a knight in shining armor, but her stuffed animals that come to her rescue. It may sound crazy, but Kaya isn’t pretending: she loves her stuffed animals so much, they come to life and turn into people! Plushies come in all different shapes and sizes, and so do their hearts—whereas some are nice, there are others who are not so kind.

Keisuke and Makura are childhood friends who grew up together almost like brother and sister. One day, due to a misunderstanding they had, Makura left the house angry until Keisuke's Mom is worried about Makura not coming home yet, thus Keisuke is told to go look for her. Reluctantly, Keisuke went out to find Makura, He ended up at a place they used to go often, the sunflower field. Luckily, Makura was there. Keisuke joined her sitting on the bench and they began to reminiscence. When Keisuke decided that they should head back home, he phoned her mom to say that he found Makura, only to be shocked when her mom told him in panic to head to the hospital. At that same moment, he looked at Makura, who was not standing but floating in the air...

Ash may think he's seen everything when it comes to Pokemon, but is he ready to face the mysterious Darkrai in his latest awesome adventure? While touring Alamos Town, home of the Space-Time Towers, Ash and his friends discover that the town's special garden has been ransacked. Some of the townspeople immediately blame the destruction on Darkrai, a sinister-looking Pokemon said to haunt the garden. But is Darkrai alone responsible for all the strange happenings around town? And what is its true nature? Will Ash and his friends discover the answers in time to save Alamos Town? There is a movie of this.

Rocket Princess was written by Nobuyuki Anzai before he started his work on Flame of Recca.

Basically, we follow Ishibashi Kango through his days as he interacts with a cyborg by the name of Oozora Kohime.

If you liked Flame of Recca, then I'm pretty sure you'll find something to like in this one, too.

The Continent of Song is in chaos. The sinister secret society known as Demon Card is using the power of Dark Bring to destroy everything in their path.

The only things capable of stopping Dark Bring are the Rave stones. Unfortunately, the Rave Stones were scattered around the globe in an explosion 50 years ago, so now they must be collected by the Rave Master in order to stop Dark Bring once and for all.

This new task has been given to Haru Glory, a sixteen year old boy from Garage Island.

The World's fate now rests on the new, young Rave Master.

Asaka, the prison's nurse, is leaving her post to her gorgeous granddaughter Yuki, who will bring a lot of troubles and chaos in the life of the people around her, starting with detective Tatsumi, her childhood friend and now her neighbor.

From TokyoPop:

After 1000 years of peace, the wolf god Fenris Fenrir has been reborn. She seeks to find the reincarnation of Balder, the most beloved God, as the land of Midgard sinks further into anarchy. They are both key players in the coming of Ragnarok, the time when fate and free-will shall come into conflict as the very nature of the universe is forever redefined.

RilleL:
Based on norse mythology, ragnarök is the term for the end of the world. Christian equivalence would be the last judgement.

The popular Korean MMORPG "Ragnarok Online" was based on this book.

[From Aku-Tenshi]:

In the center on a metropolis city lies a small, shaky-looking house. A normal... Okay... Not so normal high school student, Sakura Tetsu (and his family), who works day and night relentlessly to support his family's living expenses, lives there. All is normal until one day, people from the future, alien pirates from outer space, appear. The underground kingdom claims Tetsu's land. Will he prevail in protecting his own land? Or will he surrender his land into many more invaders to come? Yes... Weirdness and insanity ensues!

Ikewaki Gajirou, nicknamed Gacchan, is the most valorous of the Big 5 in his school. He's a pretty good person. However, he has one flaw that people fear him for...

From Tokyopop:
On a world with no women, the surviving men have reintroduced the female in the form of an android. Called Marionettes, they are built to serve men and are limited in their interactions with humans. That is until a poor boy named Otaru Mamiya encounters a Marionette named Lime. Lime is a Saber model with a special circuit that gives her emotions. When Otaru awakens two more Saber Marionettes, his life as an 'average' man quickly becomes as extraordinary as the lives of his eager, busty new friends.

From Yen Press:

Millennium Academy is a school where elite vampires are trained to maintain balance in a world where humans and vampires, who possess far greater physical strength than their human counterparts, coexist. And commuting to this school is Aldred, the most distinctly un-vampire-like vampire to be found in the entire institution. But when Al encounters Kei, a human transfer student to the school, their destinies become intertwined, and the fate of their world as they know it comes to lie in their hands!

The story revolves around Tsukune Aono, a boy who accidentally gets enrolled in a school inhabited by monsters and demons. He quickly befriends Moka Akashiya, a vampire who soon develops an obsession with his blood, and later meets other girls who soon take a romantic liking to him.

Being a housewife is no picnic, especially if you have to deal with an idiotic hubby, two reckless children, a mother whose hobby is to decapitate moving “things” and those annoying zombies that are always out to have the best bite of you. A hilariously bizarre tale from the king of gag manga: Kenji Hamaoka of Urayasu tekkin kazoku (Super Radical Gag Family) fame.

The story revolves around Wakame High School's extracurricular club, "Sexy Commando Club," which consists of 5-6 male members (one being the high school principal himself), a female manager, and a small mysterious pet (that may be extraterrestrial in origin). The strange and ancient art of Sexy Commando (the roots of which extend back into Japan's Muromachi period) is a martial one; however, instead of focusing on how to defeat an opponent with punches, kicks, or grappling, it focuses on how to distract the opponent. The logic follows that any distracted opponent is unable to fight, and therefore the art of Sexy Commando trumps any other form of martial arts. There are as many techniques as there are ways to distract, though Wakame High School's Sexy Command Club tends to employ the unzipping of the trousers (Elize no Yuutsu).

On the once-peaceful planet of Industria, constant battles have been fought over control of the planet. Astro is a dim witted but kind boy who tirelessly works to feed his "family," a group of orphaned children. One day, after being fired from his most recent job, the prince of Industria, Bulge, appears in front of him. And even more shocking, Prince Bulge looks and sounds exactly like Astro! One thing leads to another, and Astro now has to take Bulge's place as the heir to the throne of Industria! Suddenly, he's faced with the task of bringing peace and harmony back to this war-torn planet!

- Red Hawk NEO

The Mana Tree, the giver of mana and life for the world of Fa'Diel, burned down nine centuries ago. A war erupted between faeries, humans, and others seeking the scarce power of mana that was left. When the war concluded, the drained Mana Tree slept and throughout the many lands of the world mana was stored in ancient artifacts.

Toto, and his pet Rabbi, have set out on an adventure to restore the world, and its mana, to its former self.

The Lands of Fa'Diel are populated with a large number of different creatures, including humans, faeries, demons, the jewel-hearted Jumi race, plant-like Sproutlings and Flowerlings, miner bears called Dudbears, and shadowy beings of the Underworld known as Shadoles. Fa'Diel is also the home of a host of anthropomorphic animals and objects, as well as monsters such as Rabites, Chobin Hoods, and Goblins.

Adaption of the PlayStation game of the same name.

From Tokyopop:

Fifteen years ago, a set of twins--a girl and a boy--was born to the king of Linevan. Shortly after their birth, a prophecy foretold that when the girl turned 16, she would bring about the end of humanity. To avoid this terrible fate, the king ordered the princess disposed of...scrapped!
She miraculously survived and was raised away from the kingdom that would kill her. But now she has turned 15, and the king's guards have caught wind that she's still alive...and they set out to finish the job!