[Delirium-Zer0]

Oh, i know a few really good ones.

The rules against pictures on fansites in japan are MUCH stricter so you're not gonna find any galleries.

Anyway, here are my favorites:

Hamasaki Ayumi yo, kaze ni nare!: http://www.calvadoshof.com/artist/HamazakiAyumi/
AYUMI2000.com: http://www.ayumi2000.com
ayu_happy (outdated now, but still has some good stuff): http://members.at.infoseek.co.jp/ayu_happy/
monochrome (MY favorite, personally. LOTS of data.^^): http://www16.ocn.ne.jp/~monochro/

Hope this helps