This is a list of communities and resource sites that I think it's important to get involved in, or that I've seen referred to by people in the game dev industry.
The VG Resource
Sprites, sounds, models, forum, etc. Great resource for 2D ripped and original art work and inpsiration.
Community for indie games. Forums, dev logs, playtesting feedback, etc. This is where we should go when we have a game that warrants play testing.
Developer forums and game announcements about the Oculus Rift.
Submitted games for review. Peer-reviewed games
Indie Game Dev community and database.