When I look at collaboration tools for writing and editing, I break them down into points on two axes of time and space
A blog is a reverse chronological accounting that uses space (scrolling in one dimension) to indicate the passage of time. A wiki is a fixed space that changes over time, but includes history
An IM session is live, with no editing, allowing synchronous communication with viewable history
EtherPad and SubEthaEdit's collaborative writing allows synchronous editing
virtual space (the medium of the document)
real space (many people simultaneously writing in different places)
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Neat, simple. Depending on the language selected from the menu, colours and antialiasing may make the text a little difficult to read. Not as many features as Etherpad.