At Slate Magazine, Laura Moser reviews the best Bluetooth cell phone headsets. To begin she offers this interesting trivia:
The name Bluetooth is a tribute to 10th-century Danish Viking King Harald Blatand (Bluetooth in English), renowned for unifying the battling tribes of Denmark and Norway. Bluetooth similarly unites different electronics devices, transferring small files of sound and data over short distances (up to about 30 feet) without the mess of cords and cables. For example, it can wirelessly connect your laptop to your printer, your speaker to your stereo, and your cell phone headset to your cell phone.