[swombat]

it basically just uploads and downloads files

You obviously have no idea just how many things can go wrong in that apparently simple process. With dropbox, it just doesn't go wrong. That's what's awesome about it - flawless, works every time, and quasi-instant.

It's 20x quicker, if i want to give a file to my cofounder who's sitting next to me, to put it in our shared dropbox than to use any other method of sharing. Every other method of sharing takes at least 10-20 seconds or more. Dropbox takes half a second. (only exception being, of course, very large files, where usb sticks still help)

[elblanco]

Exactly, it's like having an intranet drive, everywhere. Without having to VPN in, and fight with bandwidth problems and other such issues. Plus, since it also stores locally, you can work offline on things that are in your dropbox and it'll sync as soon as you get connectivity.