Aah you're correct; I had forgotten about that. I suppose syncing all someone's Amazon-related files makes sense in a way. Kindle, MP3 purchases, etc. I may be wrong, but I don't think Dropbox has a technology which is Earth-shatteringly better than than its competitors, although I agree it is the best in the space. And heck, if Amazon bought them, they'd lose all that sweet sweet revenue from Dropbox ^_^.