One feature of iOS 5 that has become a favorite during my beta-testing of the new mobile operating system is Wi-Fi Sync. This is exactly what a lot of iPhone users have wanted since 2007, and now it's finally here and working well.
To sync with iTunes on your Mac over Wi-Fi, you need to open Settings > General > iTunes Wi-Fi Sync on your iOS device and also have iTunes up and running on your Mac. On iTunes, be sure to check "Sync with this [iOS device] over Wi-Fi," which is found in the Summary information for the iOS device you're trying to sync.
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