BasicMicro has produced a 32x32 RGB LED display. Go to
http://www.basicmicro.com and check it out at the bottom of the home page. I *think* it may be available for sale. Contact sales@basicmicro and ask.
But that's just the proof of concept circuit. Check this out!
http://www.youtube.com/user/basicmicroAnd they say this is part of a modular system that can become a 6'x8' wall!
You won't see much here on the subject. Try
http://www.electro-tech-online.com and do a search on "matrix" or "LED array". IIRC, I have seen quite a few posts about LED arrays there.
Have fun with your project!