It's online document editing with approvals, diffs, etc.
The funny thing is regular business users think of it as a wiki. Me and you know different!
Think of the business folks at Wells Fargo or any other larger enterprise. They will upload 100's if if not 1000's of documents. Now they can link between documents or just work on each document as they do.
Wiki is a word we think doesn't fit -- but we keep running into it.
The joy of start-ups: too much uncertainty!