In statistics in college, a I and a bunch of my friends (CS students) took cooperative notes in Google Wave (which, by the way, I still maintain was amazing). Generally, a friend would be taking notes as quickly as possible, and I would follow him and replace his ad hoc notation with the correct unicode mathematical symbols to make everything look really nice. But then we found all the homework solutions and sample tests (by looking at the format of the URLs of the previous ones he gave us).