Writely - The Web Word Processor(link) sounds like something really neat. I am wondering if it uses RubyOnRails to do it's thing. In any event, I'm definitely thinking things like this are great for podcast shownotes or resumes and cover letters.
I mean imagine people being able to add to the show notes of a podcast with things like ratings for games, further explanations on tech hints and then it *might* be downloadable by the audience. I have to go check that last point.