Manga Chasers good friends of otakustew.net from Australia! Go check out their How to Draw Manga series!
Dark Horse Comics one of the best manga publishers in the USA. Lone Wolf and Cub, Gantz and others
Yen Press another great manga publisher. Soul Eater, K-ON, Spice & Wolf and others
Viz Media bringing you such manga as Naruto, Bleach and others.
Manga University a good place to pick up tips on how to draw manga!
More to come! This list will be updating as we run across new sites to help you the reader find out more about manga!