Sites I hold dear:
CLAMP-NET - CLAMP's site. Only in Japanese, unfortunately. When I grow up I'll translate it. *determined*
Blue Skies - an absolutely lovely Fye D. Flowright fansite. Go there, learn of Fye's greatness! What are you waiting for?
Black Hole - the home site of Yi, who is a good friend despite not liking CLAMP. Has nice artwork.
Animexx - a German anime/manga community I frequent (my nickname there is Umidori).
Okashina Okashi - a delightful webcomic. Highly recommended. Parodies CLAMP, among many other things.
Tsubasa MB - a nice message board which was about Tsubasa originally but has kind of strayed off-topic and fallen asleep. I still like it, though (my nickname there is Umidori).
SoraMB - another nice message board, this time about nothing in particular (my nickname there is Umidori).