My picks:
Javtalk, Scanlover forum, Puretna, Empornium and Asiansthetic forums.. And many other sites although most of the posts here and the other sites are translated re-posts from Chinese or Japanese p2p web sites.. I suggest you gear up with some basic navigation skills and browse those p2p sites.. Or you could just wait for posts by seasoned posters here at Akiba.. They usually post good stuff. But if you want rare stuff (videos not posted here or any English forums). You can also try ShareEX2 or WinMX.