During a meeting this past week here at Brigada, we demo’d …

http://screenhero.com/

Essentially, it allows you to take any application online as a multi-user web app. From what we could determine, it seems to be limited right now to just two people at a time actively editing, but, bottom line, if you have a need to do joint planning with your spouse or teammate, at least give Screenhero a shot. Sessions are free — and encrypted.