Most of these are for motion graphics/3D work but a lot of the techniques can help you out with what you're wanting to do.
http://forums.creativecow.net/
http://www.cgtalk.com/
http://www.videocopilot.net/forum/
There are lots more but those 3 are a good starting point.
http://forums.creativecow.net/
http://www.cgtalk.com/
http://www.videocopilot.net/forum/
There are lots more but those 3 are a good starting point.