We use dropbox all the time, I kinda of thought dropbox was stupid when I first heard about it. Now I can't live without it.
We pay for the 200gb service. There are a ton of legal reasons to use it.
We used it with Stephan Hicks ( rip) to share work that we retouched.
We use it to get models there images.
We use it to capture the images from our cell phones.
We also use it in a team environment to share company information for diverxity (
http://j.mp/diverxity )
I have heard a lot of great things about box, but never tested it.. so I will give it a shot.. thanks..