From Tokyopop:

Drawing on CLAMP's own personal experiences, The One I Love provides insight both into the creators' own lives, and into the oft-elusive concept of Love itself.

This intimate collection of short stories and essays doesn't skirt issues at the heart of the matter such as insecurity, honesty, distance, independence, age, and - of course - marriage.

This one-volume anthology comprises 12 individual stories, each of which consists of seven pages of manga and two pages of prose.

In the future, the most popular game in the world is Angelic Layer. Contestants must raise and train their own 'Angels' (or fighting dolls) to compete in tournaments. Enter Misaki Suzuhara, sixth grade Angelic Layer prodigy. With her speed-type angel, Hikaru, many people think Misaki stands a chance at winning the championship. She'll have a lot of help along the way, but the road to victory will be not be an easy route, especially for someone as young as Misaki.
(Source: Tokyopop)

From Be With You Scans:
A collection of bittersweet tales of all the different shapes an unrequited love can come in. Why is it so difficult to confess your love? Why is it that another person can affect someone else so strongly? When a powerful man is fickle, he is allowed to be. But if a woman is unfaithful, she is called a tramp. Koi tells the realistic stories of six different women of different ages, and completely different outlooks on life.

From Viz:
Kamui Shiro is a young man who was born with the power to decide the fate of the Earth itself--a destiny he can barely bring himself to believe. But as other players in the prophesy begin to gather around him--the "Seven Seals," with the power to protect the Earth, and the "Seven Harbingers," who are fated to destroy it--he has no choice but to come to terms with his fate.

-ON HIATUS-

One night, a man named Shuichiro Kudo comes across a tiny angel trapped on a tree branch. He frees her, and in return she offers to grant him a wish. However, Shuichiro is a successful doctor, with a home and everything he needed; he declined the angel's offer. The persistant angel, named Kohaku, refused to give up, stating that "some wishes cannot be fufilled by oneself." After settling in at Shuichiro's home, Kohaku reveals her mission to track down the Angel Master of Wind, Hisui, who has abandoned heaven. That is, if her devil rival and his two catty servants would let her leave long enough to do so...
(Source: ANN)

From Clamp no Lumiere:
Murikuri is the story of a popular pig, a pervert santa claus and his high school girlfriend, nice aliens and many more... It does not make sense and I would advise you to not try to understand it. Murikuri is to CLAMP what special halloween is to the Simpsons, a collection of short gags.

A magical cooking lesson about making horan (soft-like pancake made without baking).

An introspective, character-driven series, Tokyo Babylon reads like a manga version of The X-Files. Its story -- a modern-day fantasy -- follows a young onmyouji (spiritual medium) on his quest to protect Tokyo from evil spirits.
Teenaged Subaru Sumeragi is the 13th head of the Sumeragi clan. Together with his twin sister Hokuto and the mysterious veterinarian Seishirou, Subaru travels around Tokyo, calming the ghosts that threaten the city.

Many different oneshots published in Newtype Magazine, each involving xxxHOLiC and another CLAMP title.

Kindai Mahjong:
A short gag "series" that Clamp draws in various magazines. This one came from Kindai Mahjong, a gambling magazine. It features a certain blond bishie from Gohou Drug along with a couple of other characters from xxxHOLiC.

About a little boy who fears the world around him and finds safety only when he is completely hidden under the covers of his futon. To him, a futon is a kekkai (spirit barrier) which can protect him from evil.

Hinata Asahi is a high school student who lives alone with only her teddy bears to keep her company. Her life becomes much more exciting when the handsome Shirou Asou, moves in next door -- not only is he really cute (even if much older), but he's also her new teacher! Hina has a bit of a crush on Asou-sensei, but when the older man seems to take an interest in her as well, is it a forbidden love or something else? (Source: Tokyopop)

Kenichi is a high school guy who wakes up in a magical land. Together with a fairy and a swordsman, he must recover two magical items to save the magical world as well as his own.

From Tokyopop:

Kentaro and Takeshi are two freshmen who are periodically called upon to transform themselves into monster-battling superheroes, complete with capes and armor... but there's much more than meets the eye...

Kazahaya is rescued from freezing to death on the streets of Tokyo by another young man his age named Rikuou. Now Kazahaya rooms with him (who he dislikes for his attitude, even though he's grateful to him for saving his life) above the drug store they both work at, Green Drug. Both work for the mysterious store owner Kakei, while putting up with Kakei's "friend" Saiga, who is always teasing them. The strangest thing about Kazahaya's job is that he and Rikuou are often sent on "extra jobs" by Kakei ...which are different and stranger every time, be it to retrieve a book or a girls' school uniform. Kazahaya always accepts the "extra jobs" so he won't end up without money and on the streets again...but he really wonders what the purposes are of these "extra jobs".

-On Hiatus

To honor CLAMP's 15th anniversary, CLAMP no Kiseki: The Ultimate Collection features full-color pages, exclusive material, 6 pages of new, never-before-seen manga, and limited-edition collectible figures!

CLAMP School Detectives focuses on the exploits of Akira, Nokoru, and Suoh - 3 pre-teen sleuths - and their quest to make the CLAMP world safe for the girls in their class ...

[From Tokyopop]:

Chun Hyang is the feisty young daughter of the village shaman and a master of the martial arts. When a tyrannical warlord threatens harmony in her village and abducts one of her friends, Chun Hyang vows revenge and sets off on an adventure that would become a legend.

The story is incomplete and it looks like it will not con.

Hideki's just like every other guy in the 22nd century. He just wants a good job, a good car, and a sexy robot girlfriend to call his own. Until he lands a job, he'll never be able to afford his own 'Persocom' companion. Hideki's luck changes when he discovers Chi--an adorable but seemingly stupid Persocom--tied up in a pile of trash. His first robot companion turns out to be a lot more responsibility than he expected, and she gets him into quite a few embarrassing situations. It's 'boy-meets-girl' for the cyber age. (Source: Tokyopop)