I'm not sure exactly how it works, but I started with this list of courses and started browsing. There are some very interesting things there. I'm posting this here primarily for me, so I'll remember this time. I know there's something I'll enjoy learning.
If you're interested in learning something new, or taking a refresher on something you've already learned, be sure to check it out.
Another source for free online courses - Edex.org .
I'm checking them all out!
