[tempire]

Math: http://khanacademy.org

Computer Science: http://aduni.org

Another vote for khanacademy. I did this myself, and worked out a plan to put every piece of information into long term memory. When you're motivated and not limited by century-old university bureaucracy, you can move very quickly, and run circles around people with a "real" degree, most of whom have forgotten everything but the general concepts.

Udacity is also coming up as an excellent resource, but the important thing to realize is that every resource adds a different perspective on the matter that is extremely valuable.

For CS-specific information, aduni.org is a glorious resource. It's from 2001, but the CS basics never change. I'd recommend getting a handle on all the math from khanacademy so that you understand everything they're referencing.