HTC has teamed up with Dropbox to offer an exclusive deal. New HTC owners that purchase a device running Sense 3.5 will be greeted with 3 extra gigs of Dropbox space, that makes for a total of 5 GBs in total.

As of this post, the HTC Sense 3.5 interface is only available on the HTC Rhyme, a new device aimed at female users. There is no word yet wether or not HTC plans to update older Sense devices with the new ROM.