Google Docs has always had easier-to-use collaboration features than much of what Microsoft has to offer. Docs has been particularly useful for individuals and small businesses who need to throw together a document quickly with geographically scattered users, but the newest additions allow users to see each others’ edits on a per-character basis. This means you can watch what your coworker is typing into a document in almost realtime, and up to 50 users can be connected to a document at a time.
Near real time collaborative editing is an excellent feature. The article points out that not all the new s is good. With the demise of Google Gears, Docs offline mode is coming to an end.