There is a useful LifeHacker post titled The Cleverest Ways to Use Dropbox That You’re Not Using excerpted here:
“Free utility Dropbox is great at syncing files between computers, but it has a lot more potential than just that. Here’s a handful of clever ways you can use Dropbox that you may not have thought of.
If you haven’t read our first article on this subject, be sure to check out how to use Dropbox for more than just file syncing, where we covered using it to sync passwords across PCs, access portable applications from anywhere, or control your computer remotely. Let’s add to those ideas and walk through a number of interesting use cases for Dropbox…”

I love dropbox. Used it all the time. My school district cut it off one night though and I was told that they would not allow me access no matter how I used it. So disappointing.