The Word Processor in the Google Docs suite was the original Google Doc modelled on Writely which was purchased by Google. Check out this movie to see a Google Doc in action.
For your chance to play I've created a Google Doc which you can edit here.
Click here for some notes to get you started with Google Docs.
Note when a Doc is shared and opened by more than one editor, all editors can access a chat window to use for discussion.
Back to the main Google Docs page.