So a friend of mine would define this technology as "hot". Microsoft just aquired the FolderShare company. I just installed the trial version of Foldershare. You should read up on the features. It's pretty impressive.
The highlights are you can synch file changes between computers while they are running, over the Internet. Then you can go to this webpage and search all your computers from a single webpage! A nice side effect is that you can go to the website, login and browse the file structures on your computers. As long as they are running.
Might want to choose a strong password for this one, but it's a great service!!