Going back to school...often a "resolution" for the New Year.  Several free sites exist, all well know and well respected exist where we can all go to improve our knowledge.  While you won't get a degree from these sites, you can get a certificate of completion.  I for one am not necessarily a "Certificate collector" and value the information much more.

Here are three site I am aware of:

MIT online: http://ocw.mit.edu/index.htm

Yale online: http://oyc.yale.edu/

Kahn Academy: http://www.khanacademy.org/