I love anime.
Watch Anime Online | English Dubbed / Subbed Episodes has a *huge* list/compilation of anime to peruse through.
Bleach- about gods of death and their struggle against dark spirits
Cowboy Bebop- bounty hunters. in space. nuff said
Elfen Lied- nice short series, sad and beautiful. About a girl with genetic super powers
Hellsing- Dragula (Alucard), updated story with guns
Avatar(listed in OP)
Soul Eater- interesting relationship between living weapons and their wielders, has a surreal halloween feel