Legends say that when it snows, it is because the snow princess is crying. A collection of five tragic tales, all connected by the bond of snow. Shirahime-syo is CLAMP's tribute to traditional Japanese form and storytelling.

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.

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!

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.

[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.

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.

From Be With You Scans:
Chie is a young girl with wonderful parents to look up to; her archaeologist father lives with her in Hokkaido, and her mother is a great scientist working in America. During a local cave excavation, Chie and her father discover Tyrannosaurus eggs, and they're about to hatch! This little girl becomes their mother, and does what she can to protect them from those who want to experiment on the little baby rex.

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

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)