Draft is a very cool site that I juts found out about from Larry Ferlazzo's blog. This site is similar to Google Doc's in that it lets a user create a document and then share it w/ others to collaborate on. What makes Draft nice is the ability to see the changes highlighted and then deny/accept them before adding them to the document. Also, a person has the ability to "ask a pro" to get professional writing help on a document for a fee.
I recommend checking out Draft by clicking here!!!