It's an awesome service. And one of the thing I like is that if I refer someone else to it then they give me extra free space. Everyone gets 2GB for free, and you get 250MB for each person that takes you up on it (and they get the 250MB as well). So, if you'd like to give dropbox a go, and you'd like to start off with an extra 250MB of space, then click here, and take it for a whirl.
(I feel somewhat odd touting a service on my journal, but I genuinely love Dropbox to bits, and I was recommending it to people before you got anything for doing so, so I don't feel _too_ bad about it.)