I just bought a pair of these
http://accessories.dell.com/sna/productdetail.aspx?sku=A0620845&c=ca&l=en&cs=CADHS 1&category_id=2999&page=external when Dell had them on sale for half price. They come with a Bluetooth audio transmitter, so you can plug them into anything that has a headphone plug on them. This also has the bonus of by-passing the Bluetooth stack issue on the Axims. You can also use them off a standard bluetooth device that has the right stack, but my laptop doesn't currently have a bluetooth card in it, so I'd need to use a dongle anyway. Sound is good quality, although I'm not an audio-phile by any means. Range is good, at least 20 feet. People in the office look at me funny when I walk over to the printer still wearing my headphones.

Battery life hasn't been an issue at all; I plug them in at night, and they last me all day.
All in all, I'm a happy camper with them. I wish they were cheaper, but I got a good price on them, I think. Don't tell my wife, though.

I'll never go back to corded phones. It's just too convenient not having cords to either pull your headphones off your desk, or strangle you when you get up and forget about them.
Clint