I updated my trusty iPhone 4 to iOS 5. While everyone is talking about siri and all the stuff siri says, the feature I’m find most helpful is wifi sync.
Once wifi sync is enabled on an iOS device, it shows up in iTunes all the time. So, if you want to put a new app on your iPhone or re-arrange the apps on the screen from iTunes, you can. And what’s more, you can initiate a sync from iTunes and update you iPhone while it’s still in your pocket. Nice.