Community sites
Animemusicvideos.org:
http://www.animemusicvideos.org/home/home.php
This is the biggest and most popular site to download and publish anime music videos (AMVs). The downloads are fast http direct downloads.
(Requires registration)
AnimeSuki Forum:
http://forums.animesuki.com/
AnimeSuki also lists recent anime fansubs, and strictly forbids posting licensed material. The forum they offer is one of the biggest and most active anime forums out there.
Minitokyo:
http://www.minitokyo.net/
This is one of the biggest archives for high quality anime wallpaper and scans. (Requires registration).