SynchroEdit
Christopher Allen’s SynchroEdit is a browser-based simultaneous multiuser editor for “same-time” collaboration.
If (as a fellow-Windows-user) you’ve read how Macintosh users passionaly love SubEthaEdit, you are at risk to fall in love with SynchroEdit.
Did I mention that SynchroEdit is open source, and FREE?
[via Life with Alacrity]