[DufusM]

Windows Live Mesh, an equivalent Microsoft product, has the p2p sync functionality in addition to cloud sync.

http://www.winsupersite.com/article/product-review/how-to-li...

[phlux]

I dual boot most of my machines, so I find anything that is 100% windows only to be less than optimal.

But the tech is interesting.

[Hume]

It supports linux too, I've had it up and running on Mint and Ubuntu for at least 6 months.

[contextfree]

fwiw, it supports Mac as well.