http://www.wired.com/wiredenterprise/2012/04/firebase/Melih Onvural ran into James Tamplin one morning while riding into San Francisco on a streetcar. Onvural had a laptop. Tamplin had Firebase. And by the time they reached downtown, they’d built a chat application that could serve hundreds of thousands of people.
I'm a late adopter of Dropbox, I've always got a machine on that I can log into remotely and get my files, so something tells me I won't be fast onto this one.