I have a huge bookmark list of my favorite cels 
sites, but these are my top three!

Carol's Nuri Shrine:
http://nurikoshrine.rubberslug.com/gallery/home.as
p

Mei's Little World:
http://www.tkngrl.net/index.html

Picture Perfect:
http://www.kishuku.net/picture.html

Dustie Stars:
http://dcs.rubberslug.com/gallery/home.asp

Cel-F:
http://celf.rubberslug.com/gallery/home.asp


There's a ton more that I love, but these ones I 
visit quite often ^_~