Manga Traders - It requires registration. Their downloads are usually chapters bundled into volumes.
Crazy's Manga - It also has a small selection of raw manga.
StopTazmo - Another DDL site. Can't have too many.
Rawscans v2 - Raw manga, if you're learning how to read moonrunes.
BakaBT - Torrent links for older and/or finished manga.
Gotlurk - Botlist for manga downloads. (Server terminated due to lack of funds and staff.)
Rawdistro - XDCC Packlists for Raws
Online Manga - A list of manga that's published online.