Sync.in is a web based word processor for people to collaborate in real-time. “When multiple people edit the same document simultaneously, any changes are instantly reflected on everyone’s screen. The result is a new and productive way to collaborate with text documents, useful for meeting notes, brainstorming, project planning, training, and more.
http://janeknight.typepad.com/pick/2010/05/syncin-realtime-collaborative-word-processing.html