Lifelong learning is a good practice to have in the world of fast pace changes in technology. Today there are several opportunities to pick up new skills and learn new subjects online. Over the past year, I have found several free resources to learn and actually receive a completion certificate from top universities. Subjects covered include (but not limited to) business, finance, the sciences, engineering, programming, math and philosophy.
Check out the links below and see if there may be something worth your time:-)
MIT Open Courseware: http://ocw.mit.edu/index.htm