NoteCentric is a service that allows University students to share and collaborate on class notes. The service is university based and, like Facebook was, only accepts registrations from people with .edu email addresses. I couldn't find any details on traffic or membership, and it seems the service just launched recently.

The service was founded by Hung Truong, a Computer Science student at the University of New Mexico, and was built using the Ruby on Rails framework. Activity seems to be currently limited to Hung Truong's personal notes at his university.

I see two problems with this service. First, how many students will actually have the time to contribute notes by typing them out onto a computer? It would be time consuming with little to no benefit to the contributor. If they have it on paper already, why duplicate it online? Second, how many students with the time to use this service would actually be willing to make their notes public? Grades in most University classes are curved, causing any help you provide to classmates be potentially detrimental to your own grade.

However, if the service were to integrate Scanr-like features, where you could scan or photograph notes and convert them to a digital format, I could see it being much more useful to college students.