Apple Insider reports that the new AirDrop feature in OS X Lion is limited to modern Macs
Mac OS X 10.7 Lion introduces a new feature in the Finder named AirDrop, designed for easy file sharing between nearby systems. However to use AirDrop, you'll need a Mac incorporating hardware support for the new feature, which involves Mac models built no earlier than late 2008.Inside Mac OS X 10.7 Lion: AirDrop limited to modern Macs
