I sincerely dig the word processor in Google Docs. It's quite good at handling multiple concurrent editors, and you can post to other platforms like WordPress from there. The recently added Folders feature is killer, and my Google Docs "list view" has started to become like an Inbox for me in the beginning of my day, as it neatly displays newly edited, and newly added docs.
Once you use a real-time collaborative editor like EtherPad, you can never go back to something like Docs, it's too primitive.