Though it's not based upon the most recent Bluetooth 2.0+EDR technology supported by iPhone, Aliph's Jawbone Bluetooth Headset ($120) uses the still-compatible Bluetooth 1.2 standard, and applies some smart, novel technologies to eliminate background noise when you're making cell phone calls. Digital audio filters and a specially positioned microphone enable Jawbone to "Noise Shield" out even loud ambient sounds, assuming you activate the side-mounted…
