Dropbox
Dropbox is a web drive (as in a hard drive on the web) that instantly syncs any changes you make to the files within to all machines that are set up with your dropbox account. The screencast on the website seems pretty friggin’ awesome.
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Whoah, this thing is massive. The fact that it versions your files AND ties in single-click web sharing, it’s like having a Time Machine (of the Apple variety, not of the H.G. Wells variety) tied to a web server tied to every machine you work on.
No mention of cost yet…