AnimeMusicVideos.org: 

Database of basically all AMVs ever created.  Has

useful video-editing guides among other features.

Envirosphere:

Great fansub resource, shows what fansubs are

released each day.

Gamingforce:

Hosts a great forum and also hosted Gamingforce

Audio which was a great VG Music site.

RPG Fan:

Great RPG news site, has a lot of info on

soundtracks, upcoming games and other features.

Overclocked Remix:

Videogame music remix site, one of the only and best

out there.  This place has some sweet ass music.

Anime Remix:

Same thing as OC Remix except for anime music.

It’s fairly new so there is not much music there yet

but looks promising.

Video Game Jam:

Great guitar tab site for videogame music.  Has tabs

for most Square games among almost any other game.

Anime / Jpop Tabs:

Same as VG Jam except for anime and jpop music.

Has mainly chords and not tabs.