Back in January I wrote about a new player in sync/backup called SugarSync. SugarSync, which is new to sync/backup but not to online services, backs up everything (or as much of everything as you choose). It also syncs with all your chosen devices (Mac, Windows & phone) and makes it all available, through a secure connection, to any Internet-connected computer.
The below video shows a great demo of how the product works which James Kendrik pointed out.
After using it in beta for several months I bought a one-year subscription, which set me back $25. I rarely buy services or software always preferring FREE. But this was too good a service to pass up. [DISCLAIMER: After buying a one-year subscription, the kind folks at SugarSync gave me a free life-time 100GB plan (though they didn't refund my $25 :) ).]
Honestly, I now worry far less about lugging my laptop around knowing that I can get anything I need wherever there's an Internet connected computer. And while I have a fairly robust backup strategy in place, it's only as good as it's weakest link...which is usually me.
If you're looking for an online backup and synchronization service SugarSync is worth a look.