It looks like there is a new player in the online document review field: Backboard. I read about it on the Read/Write/Web blog this morning and have been playing with it for a while. Basically, what it allows you to do is share documents with others, online, and leave written comments on those documents. Looks like a neat little tool, although I am still not sure whether it would be more useful for my purposes than, say, Google Docs or Google sites, both of which also allow users to leave written comments.
I suppose that Backboard would claim that it offers better security to enterprise users, at least if you are using a premium account which costs a few bucks a month. Oh, and I think the choice of the name for this new service is somewhat unfortunate--too close to my all-time "favorite," Blackboard.