Cult of Mac is reporting that a source told them that Apple will bring Near Field Computing (NFC) to the iPhone 5. NFC is usually used for paying for things from your phone just by swiping them over a receiver, but the source has a more interesting use: remote computing. If correct, your iPhone would become loaded with your passwords, bookmarks, settings, and desktop applications. When your NFC iPhone comes close to the NFC enabled computer, all this information would authenticate and transfer, essentially turning any Mac you encounter into your home machine.
This is a very specific rumor, and the anonymous source is unusually verbose. I’m going to remain skeptical on this front, as I think it’d be a very cool use of NFC, but would require a major overhaul of both iOS devices and Macs to make it happen.