For those that are willing to Beta Test some new software, the Windows
Live Mesh program has gone to a small public beta.
If you are interested in synchronizing files across many desktops/laptops inside and outside of your local area network, then now is your chance.
I use Live Mesh to put stuff in a folder that I would normally take home with me on a flash drive or on my iPod. When I power up my computer at home, the files are atuomatically delivered the sync folder on my home machine.
Eventually it will be spread to your mobile devices, servers and Mac support,but right now it only works between XP and Vista machines.
More info on
the wiki page.