MoGo has a nice, and very small, USB Bluetooth adapter. Ideal for traveling users, it takes up almost no space whatsoever. It has a 30 foot range and supports up to 7 devices. Like the sloppy looking wireless adapter sticking out of a PCMCIA slot, your usual Bluetooth adapter is ugly and unwieldy.
The price for this convenience is $49. A bit higher than others, but it is up to you to decide whether the small profile is worth the extra cost. In the grand scheme of things, it is not a large ticket item. Should be available in the second quarter of this year.