Have been using dropbox for about 6 months also. This is really one of the essential apps you need to get for your iphone, ipad, mobile gadgets. I’ll say most of the people have already downloaded the app but not use it to the fullest.
I shared a dropbox folder when I’m planning my overseas holiday trips -saved all the brochure, places to go, maps, etc all into that folder so that my friends could easily access the information. If google came out with an online storage that works like dropbox, it’s gonna be awesome, then users could do editing of docs, and sharing files all with one google account.
Here’s a dropbox tip for power users: adding multiple dropbox accounts on one computer