Some ubergeek named Viktor Lofgren devised a way of transfering files between computers using soundcards and noises, following the basic principles used for modems. All you need are two soundcard-equipped computers, speakers and a microphone.
Trust the rogue programmers and Cydia–the independent equivalent to the iTunes App Store–to bring you one of the most awaited features ever for the iPhone: Bluetooth file transfer.
Switching to a new computer can be difficult, and the process is only exacerbated cross-platform when you need to migrate your data from XP or Vista to OS X. Belkin has responded to the hassle with their Switch-to-Mac Cable, a USB to USB dongle that comes with software tools to automate the transition.