Some more fun dsp/digicomm sites:

Animated slideshow of how AES crypto works: http://www.formaestudio.com/rijndaelinspector/archivos/rijnd...

Digital communication tutorials: http://www.complextoreal.com/tutorial.htm

My my. This is the stuff I studied in undergrad, and I have to say that to this day, I still don't know how FFTs work, with the butterflies and everything.

I suppose it's been a point of pride for me to go back and learn it well, but I don't get to use it much in the type of software I write nowadays. This is a gentle reminder for me to crack it open, along with tons of other stuff I've been meaning to learn/relearn.

From MIT OCW, here's some more material on DSP from a course taught by the illustrious Prof. Alan Oppenheim himself in Fall 2005:

Discrete-Time Signal Processing: http://ocw.mit.edu/OcwWeb/Electrical-Engineering-and-Compute...