Some anime/manga helpers I've relayed on from time to time.
AnimeArt.com - my first, I got lots of pics and some OP/ED from this site, haven't been there for a while
Anime Lyrics - anime and j-pop lyrics, some translations, some full kanji
Anime News Network - neat anime and manga encyclopedia (amongst many other things)
AnimeNfo - anime/manga encyclopedia and stuff
Tokudane - a listing of all yaoi scanlation groups
Baka-updates Manga - updates on publishing/scanlating/subbing, and some reviews
Manga Jouhou - also updates and reviews
I've thouroughly abused Google, of course, and also the Wikipedia a little, too. More to come, probably.