In case you didn’t know…Hulu and YouTube offer free videos of college and university lectures.  There are whole courses available too – so it’s almost like you’re sitting in on a class for the entire semester.  Hulu’s thing is called Academic Earth, and YouTube’s is called YouTube EDU.  Hulu’s has been around longer and is easier to navigate (in my opinion), but YouTube only recently jumped on the free lecture bandwagon, so I’m sure they’ll be pretty spiffy too.  You can browse the videos by subject, or school, or ratings, etc.  Check it out.  :)