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Dropbox
Jason Snell just posted Macworld Video #93, which is about Dropbox, a superb application for synching files between multiple computers, which also lets you access archives of all the revisions you’ve made to  a document.
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This, for me, is an incredibly valuable application. I spend my days jumping between several different computers in a variety of locations—Office, home, MacBook—and find myself needing files that I’ve worked on at the office or screenshots that I’ve taken on my laptop. Yes, I have a MobileMe account. No, I’ve never found it to be that useful when it comes to synchronizing files.
From what I can see at the moment, Dropbox may be the perfect tool.