Papyrs is a new (beta) site that is ideal for file sharing. This is done in a social network type environment and is ideal for sharing: documents, notes, and more. What makes this more then just a file sharing service is the social network interface which allows users to collaborate, leave comments, build their own page, etc etc.
I highly recommend checking out Papyrs by clicking here!!
For a more detailed review check out Larry Ferlazzo's blog.