Wolfram Seminars
Wolfram Math -- the company that produces Mathematica, a very high-end mathematical graphing/solver program -- offers free online seminars!
And why should these interest you? Many of the seminars are on how to use their (expensive) product. But others are more general, such as the May 4th seminar called "A Tour Through Calculus."
They're interesting, informative AND... students who register have a chance at winning a free copy of Mathematica. Talk about the ultimate toy for getting 100% on the Technology criterion of your next portfolio project.
Finally, I WILL bribe you to take a seminar... bring be the Certificate of Course Completion, and you're set!
You can also take seminars in a "non-live" format through this link: