Billed as "the most powerful Bluetooth speakerphone" and quite possibly capable of living up to that claim, SuperTooth HD ($129) is a visor-mounted speakerphone solution for iPhone users with some really unique capabilities. It's powered by a Bluetooth 3.0 chip with 20-hour battery life and 40 days of standby time, falling back to Bluetooth 2.1 (and 2.0) for use with iPhones. Two speakers are built into the unit, as is two-phone simultaneous support,…
