No, they let me *upload *files that they downloaded and installed on the presentation computer themselves.
I have and use DropBox, but lately i’ve been using SugarSync more.
The free version has more storage than the free version of DropBox (5Gb v. 2Gb), but the big advantage for me is that, with SugarSync, you can simply select the folders you want to sync, wherever they are on your hard drive. You don’t have to drop them into your DropBox folder.
I’ve had SugarSync for a few months now, and so far it’s worked flawlessly.