By Dropbox's own numbers, its base has grown from five million to 25 million users in the last year, and now claims paying customers in 175 countries. Not content with this explosion, however, the company is establishing partnerships in the mobile arena to kick its growth into hyperdrive. Sony Ericsson is the first willing participant, and several of its phones (including the Arc and Play) will ship preloaded with the software throughout ten European countries. On the mobile carrier side, Tokyo-based Softbank will soon include the blue box on a handful of its Android devices, and Verizon is being courted by Dropbox, too -- nothing definite between these two, however. Good first steps, but if the company really wants to get rolling, it might want to pair up with a phone that has world domination in mind. Just a thought.