Back in March when Google acquired Writely they suddenly closed to doors to new users. Good news - as of today, you can sign up again for a Writely account. A highly-recommended collaborative writing tool - similar in idea to wikis, but different in execution. If you want/need to collaborate with someone but don't feel comfortable with a wiki, or need it to be kept away from the open web, this is your tool. Heck, I use it all the time just for notes and drafts that I want to be able to access from any web-accessible computer.
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