From Taruby:

Shiraishi Yayoi was a relatively unremarkable school girl, although a little clumsy, before a experimental accident changed her life forever. She was forced against her will by her father, self-proclaimed genius physicist, Shiraishi Sensei into a teleporter with a cat , and like in the movie "The Fly", she combined with the cat.

Now, whenever she gets excited about anything, a pair of cat ears and a tail pop into existence. In the "catgirl" form, she has super powers, but the major drawback is that she also behaves like a cat when presented with the proper stimuli, like the sight of mice. She also has a boyfriend, but her "problem" tends to interfere in their dates since her excitement inevitably leads to her transformation into a catgirl.

This is the tale of a boy whose mother was killed in a meteor strike on their island home 6 months ago – something everyone knows was the crashing of an alien ship but no one will confirm – who one day quite literally has a girl drop out of the sky on him. She at first takes him hostage from people hunting her but it eventually comes out that she’s from outer space and if there’s one thing that this boy’s mother taught him, it is to NOT leave a damsel in distress…

In a world that has become 70% harsh desert, the Rainbow Council of the International Peace Keeping Forces, a team of super-powered global security guardians, have a growing crisis on their hands. No. 5, one of their own and known within the council as their top marksman, has left his post and gone rogue. It's up to the other guardians to track him down--but No. 5, with his mysterious companion Matroshka, won't go down without a fight.

From Tokyopop: As detective Musubi Susono investigates a series of child kidnappings, her own partner is viciously murdered. But when the investigation takes a brutal turn, she is suddenly confronted by the killer--and his vicious Silicon Creature...

A futuristic world brought to ruin by Artificial Intelligence machines. The leader of the machines is a being called Prometheus. He was the first machine, the first AI. Created by a desperate man who lost his beloved family in a fire. He brings his son back to life in the form of AI. His heart is a relic of the past that houses the soul of the Titan King Chronos.

A story about a boy who notices a falling object one night and comes across an alien.

Note: This isn't complete and I doubt it will ever be. Pixiv is a Japanese online community for artists.This book represents some of the best and most recent art work from the Pixiv website.

From TJo:
Guy with a 70-word vocabulary doodles on sleeping Naked Chick in a fit of sheer immaturity, Naked Chick wakes up and attacks Guy, Guy accidentally marries Naked Chick, and then the two gang up with Noisy Girl while trying to avoid Perverted Villain and his moronic minions. Meanwhile, Perverted Villain's fiancée, Naïve Princess, disobeys her father's word and goes off in search for her love.
Got all that, or should I run it by you again?

Yuri is just a normal girl in high school: she loves hanging out with her friends, she has dreams, and she has worries. But one day, she wakes up in a strange forest she's never seen before beside a man named Chihiro. As the two of them learn more about the place they suddenly find themselves in, and the oddly real dream they had of being abducted by aliens, the dark secret of where they are and what has happened to them will begin to unfold.

Because his friends fired a rocket into the US Army camp, Suzuki was wanted by the US Army and the police. While he was running away the sea surface suddenly rose, and when a brilliant light appeared he saw a strange looking battleship flying in the air. He was dumped into the sea and when he crawled onto the battleship there was a beautiful girl standing there. She said her name was Lyx, the princess of another world, and added; "My Father is Japanese, Shinjiro Sakomizu. Please help me, Suzuki".

At the beginning there's two guys fighting. One of them loses and then that's the end. For the last 8 pages there's some hentai. You'll breeze through this really quick.

This series is a set of several extremely short pieces: usually between 2-4 pages in length. They vary wildly in mood, character and art style, and the detail is often stunning.

Note: The manga was serialized in Kodansha's novel and manga fiction magazine, which does not targeted a specific demographic rather the general reader.

Ootsuka Renji is a high school student who has been looking for love for a long time. Unfortunately, none of the 100 girls he confessed to so far have returned his feelings. Each of them also unintentionally left him with tears. Meanwhile his schoolmates are more interested about a young star in the magazines, which Renji surprisingly didn't pay any intention whatsoever. Who will be the girl for him, if ever finds someone?

Four thousand years ago, the planet Roon was frozen by the ruling race, Kama, during a raging war. The Kama then emigrated to a neighbouring planet. But now the ice is beginning to thaw, and return to the home world is fast becoming a possibility for their descendants.

Dulk is a young man who wields exceptional power, in training to become a shaman of sorts. Since his early years, Dulk has experienced vivid dreams about Roon, though he has never been to - or even seen - the planet.

When he finally gets the chance to visit the once-frozen wasteland, he will discover the powerful destiny that lies in store for him, buried beneath the rubble of Roon's mysterious history.

An online game is causing players to commit suicide. One hacker rises to solve the mystery.

Toono-kun’s life has gone out of control, all due to a strange accident that he can’t explain. There was a flash out in the school yard where his younger sister Yayoi was doing track and field, and a number of people were injured, including Yayoi. Yayoi was lucky and got out of the hospital the next day – only she doesn’t act like herself anymore. What Toono has discovered is that his little sister is gone, and has been replaced by a soldier named Luca from 31 years in the future – and he alone knows it!

A short 5-chapter story set in the future, about a boy and his passion for motorcycles.

"A.Mou" is young man who likes Wuxia and machinery. One day, when drawing manhua, he makes the mistake of dipping his pen into a bottle of "Thousand-year Ink" given to him by his childhood sweetheart, "Shona".
The two of them are then suddenly sucked into the world of the ink, where all of A.Mou's fantasies come true! Hidden in this fantasy world, however, is a threat that wants to wreck havoc. Out of control fantasies threaten the unsuspecting A.Mou like runaway trains that have lost their brakes...

Rose Hip Rose is a manga about a teenage girl who fights crime. While the setup doesn't sound so great, it gets better as the manga progresses. The series' major strong point is the art. Along the way, she ends up having a showdown with a major criminal named The Goat. However, it seems that The Goat doesn't seem to like being caught. Be wary, though, the series is very violent.

The art and story are by Fujisawa Tohru, author of GTO and Bad Company. The art is quite nice, but somewhat different from GTO's. If you like violence, gore, Fujisawa, or cacti, Rose Hip Rose is the manga for you. Oh yeah, did I mention it was violent?

Reprint contains Magnum Rose Hip as volumes 3-4