The newly released English translation (by Del 
Rey Manga) is one of the finest manga adaptations 
I've seen.  And, like any good CLAMP manga, it is 
very funny in parts, but has at least two moments 
that are guaranteed to make your blood run cold.

Tsubasa, CLAMP's other current manga that crosses 
over with xxxHOLic at one point, is, IMHO, less 
good, though it's nice to see what happens when 
Sakura and Meilin merge into one personality in 
an alternative manga universe.