This is the biggest and most popular site to download and publish anime music videos (AMVs). The downloads are fast http direct downloads.
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.
This is one of the biggest archives for high quality anime wallpaper and scans. (Requires registration).