Jawbone has introduced its new Icon HD Bluetooth headset, as well as The Nerd, a USB-based add-on that allows Icon HD users to make VoIP calls from a PC or Mac. The Icon HD features a “wideband” speaker that’s 25 percent larger than the one found in the original Icon for improved sonic performance, NoiseAssassin 2.5 noise cancellation technology, AVRCP play and pause controls, on-screen battery status indication on the iPhone, seven…