10. Teach yourself programming
9. Get a Personal MBA
8. Learn to actually use Ubuntu
7. Get started on a new language
6. Trade your skills, find an instructor
5. Academic Earth and YouTube EDU
4. Teach yourself all kinds of photography
3. Get an unofficial liberal arts major
2. Learn an instrument
1. Learn from actual college courses online
And of course, also check out Personal University
(via Robot Wisdom)