The problem with most Bluetooth headsets (aside from the fact that they make you look like a cyborg) is that they die out after a few hours of use.
Motorola is addressing both issues with the H680, a new Bluetooth headset they claim lasts for eight continuous hours and eight days of standby. Style-wise, I like the subtle look, though I think the Jawbone beats it in the design department. However, if they price it right and the battery lasts as long as they claim, it'll be worth a gander. It's expected to debut in Q3 of 07.