http://www.mangareader.net/ - Read alot of manga that you can't read anyhere else.
http://mangastream.com - Place that gets Bleach, Naruto, One Piece and Hunter X Hunter usually the fastest.
http://da-anime.org/ - amazing site with just about any anime or manga you could possibly find
http://komics-live.com/SMF/ - check out the sections for anime and manga, great stuff, they also have tons of comics but recently had to drop all marvel stuff due to a potential lawsuit
http://www.onemanga.com/ - read just about any manga online, no downloads
http://www.8manga.com/- more manga to read online with no downloads, great selection
http://www.bleachportal.net/ - download Bleach manga and anime
http://www.narutocentral.com/news/ - download Naruto anime and manga
Another great way to get manga scans is to use MIRC, heres a guide:
help me find more guys