A friend of mine just turned me on to this: http://users.ece.gatech.edu/~lanterma/ece4803/
There is a huge wealth of information there I have started watching the lectures, and I am looking forward to watching more.
So far it is absolutely fantastic, Oh do I wish I would have been able to take a class like this back at university.
I started watching these, so far only the history ones, but good info.
He mentioned Propellerhead Rebirth at some point. It's discontinued Roland (303,808,909, etc.) emulation software that they are giving away free now, looks very cool. http://www.rebirthmuseum.com/