Hello- I have installed iTunes 10.5 and iOS 5 on my iPhone 4. When plugged into the USB port there is no option for me to select Wi-Fi Sync on the summary tab of iTunes. It's simply not there. I have an iMac running Leopard 10.5.8. Any help or suggestions is appreciated! EDIT: Apple doesn't tell you, but Snow Leopard or Lion is required for Wi-Fi sync option!