WiFiSync should have existed a long time ago. Created by Greg Hughes, it uses two programs – desktop app and an iPhone app – to sync your iPhone wirelessly. I was able to sync music, movies, and info quickly and easy, just by pressing “Sync” in iTunes.
The app costs $9.99 on the Cydia store. The Cydia Store appears when you jailbreak your phone and it’s sort of a Bizarro App Store unsanctioned by Apple.