Apple has gone out of their way to point out the cons of multi-tasking background applications - a claimed 80% reduction in battery life while on standby with a single 3rd party IM client enabled. Push Notification, likewise, has been promoted by Apple as providing a single point of coordination for 3rd party alerts routed through servers on Apple's end.
Question: what's better than syncing iTunes using a USB cable and but yet isn't allowed by Apple? You got it: wireless syncing. And that's why we're saddened to hear that the originally named app 'Wi-Fi Sync' was rejected from the App Store. Fear not though, because it's now up for sale on the Cydia Store.