Before you start joyously noding your
lecture notes, be aware that many universities have policies barring their students from sharing these notes in
open forums and specifically on the
internet.
A year or so ago, a website put up fliers all over my campus proclaiming that it would compensate students for contributing their lecture notes to an online database. Within a day or so the entire student body received an email stating that this was explicitly against university policy, and that any sharing of this information whether compensated or not would be grounds for serious disciplinary measures.
It probably has nothing to do with copyright laws and everything to do with amount of money they charge us per course as well as their own future online education moneymaking dreams. The point is that whether or not it is legal for me to post my notes from class, I still must follow the regulations of my university or risk expulsion.
Just something to bear in mind.