No patentable idea...
Those who suggest a patent have nothing to patent. Synchronising contents over WiFi and Bluetooth has been done for years. May I point to the iPAQ as example, which allowed MS ActiveSync to backup and synchronise content between a PC and a Windows mobile device? May I point to Nokia who allowed Bluetooth connectivity to be used with Nokia PC Suite to again, synchronise and backup a Nokia device with a PC?
Please people, stop getting yourselves in a froth over this... Yes, it sucks for the developer, having his app rejected, but then again, Apple specifically says that they reserve the right to if it breaks rules. And it did (sandboxing). However, Apple conceded that it was a brilliant idea, and it is quite likely that that kind of functionality was already in the works. If Apple was smart, they would probably have watched the popularity of WiFi Sync rise and adjusted their new feature priority accordingly.
As for those moaning about how they could've told the developer WHY his app was rejected (i.e. "we're working on a similar feature"), please cast your mind back to how Apple does its marketing. Nothing, and I mean NOTHING, is ever leaked ahead of time by Apple staff (unless they speak anonymously), so why would they want to break that mantra officially by telling an iApp dev that they are working on similar features?
Up- or down-vote this... I don't care. But I will say this... working in software I know how commercial software is developed and how things sometimes are just purely co-incidental (and sometimes not).