Sold as a device-agnostic Bluetooth wireless car integration system, Belkin's AirCast Auto Hands-Free ($80) is nonetheless iPhone-focused, enabling users to make and receive calls using a Belkin-supplied microphone and the speakers built into a car's stereo system. The unit includes a circular call/play button with integrated microphone, an aux-in plug for your car stereo, and a charging bulb with a pass-through USB port that can be used -- or…
