AppleInsider | Hidden “Drop Box” feature in Mac OS X Lion lets you sync files across Macs.
I have messed with this a little, it syncs with your iphone, ipad and ipod touch too. I dont know if you can see this folder unless its jailbroken. On the device its
/User/Library/Mobile Documents/
on the mac’s
~/Library/Mobile Documents/
I will be putting icloud on my windows machine to test and see if it works
copy any file or delete any file in that folder and its actions duplicates to ~/Library/Mobile Documents/ on every Mac machine thats on your icloud account. The idevices, it performs the same actions in every /User/Library/Mobile Documents/