For those who don't know, EtherPad allowed users to collaborate on a single document in real-time, much like Google Wave does. (And by that I mean instantly.) Each user's edits are clearly marked. It's like Google Docs meets Google Wave, really.
New pads can once again be made from the EtherPad home page, and this will be the case until the code is completely open-sourced.
Things like this are why I really love Google.