Ask Students: How to organize and share notes?

I'm currently thinking about setting up a wiki for our university where all students can share their notes which they've taken in class. I would say that 80% of our professors provide the notes in a digital format, but there are still those 20% which sadly don't. Most students also take their notes just for themselves instead of collaborating on Google Docs or something similar.

My question is: Does your university provide a way to share (written) notes? If yes, which experience did you make with it?

check out sites such as

http://www.notely.net/ - lets you share notes with friends that are signed up, also provides org tools for students http://stu.dicio.us/ - i believe does the same thing but is down atm http://wwwnotesake.com/ - again same thing

there are others too