That's git-annex, which has been available for a long time; the new thing is git-annex assistant, which is a Dropbox-like addon for g-a. That said, wait no more! The Assistant has been available since the 24th: http://git-annex.branchable.com/assistant/
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Also git-powered http://sparkleshare.org/
I am very excited and waiting for http://git-annex.branchable.com/
That's git-annex, which has been available for a long time; the new thing is git-annex assistant, which is a Dropbox-like addon for g-a. That said, wait no more! The Assistant has been available since the 24th: http://git-annex.branchable.com/assistant/