If you're interested in some very serious learning in some of the same classes taken by university students at MIT, Harvard, Berkeley, Cal Tech, et al., you can sign up for free courses at http://www.edx.org It's seems sort of heavy into Information Technology, Science and Engineering - which is great if you're like me and into that stuff. But it also has a lot of the other courses in less rigorous disciplines. It even offers certifications for a small fee. Enjoy!
I'm actually taking a biology course on there. It's a great site. I love how the internet has made learning new things so easily! It's amazing getting education on par with that of a university 100% free. I'm considering taking more too, but right now it's enough to try and keep on top of one.