There's no danger with Dropbox since the object is to make sure YOUR files don't go blooie when your system dies. The public links that they do is legal, and I don't see any problem with sharing files that way.

But bottom line, the primary thing I use Dropbox for is backup. Also Wuala since I paid for it and got more space. I never worry about losing any work. Apps and OS I can reinstall then add in Dropbox, Lastpass, XMarks, and Wuala and I'm a happy camper.

PS if you have several PCs, also with Dropbox mirrored between them, that's another copy or copies aside from the company servers.