I didn't know about dropbox. That looks like one very useful piece of software.
It is very useful, I had heard lots of people mention it before but only really looked into it about 3 months ago. I now use it on all my machines, I can't live without it. It's and ideal place to store my documents and project folders for many things I use such as NetBeans, Eclipse and Processing. When I've been working on my desktop I just hit save and when I pick up my netbook later, everything is as I left it on my desktop, ready to continue working.