Since he's just bought a new car, my lovely father is currently in the market for a Bluetooth hands-free kit. I was going to point him toward any of the regular, bland units currently on the market, but now that I've seen Sony Ericsson's HCB-120 I'm tempted to make him buy it instead. Talktime of 24hrs should be enough to drive round the UK a couple of times, and a 300hr standby is pretty special too.
It's designed to be either clipped to the sun-visor or sat on the desk/dashboard, and a magic orientation sensor flips the display accordingly. Gizmodo's Brian Lam is a big old sour-puss and criticises it for having the typical Sony Ericsson proprietary plug; but hey, look on the bright side - considering they're Sony it could've been riddled with DRM that censored every other word.