Yeah, recording lectures really isn't terribly useful. My university has decided to start experimenting with all this technology - podcasts in one class; video recordings via camera that automatically track the professor, chalkboard, and powerpoint presentation in another - and while the idea is cool, in practice, it's almost entirely useless if you actually go to the lecture. Sitting through 60 minutes of lecture that you already saw once is a horrendous waste of your time. It's far more efficient to just learn to take good notes, then re-read or re-copy them after the class.