Man a flood of these — Writely (works well for me), Jotlive, zohowriter, writeboard. Seems like the fullscale assault on ms-office scenarios is launching. Sure, office apps do like a kajillion more things, but I don’t need all that, and the value of net-based storage and mobility outweighs it all. Techcrunch and web2.0central are great places to track these apps.