USB Bluetooth Adapter?

Can anyone recommend a USB Bluetooth Adapter for use with my PC laptop (running XP Pro SP2) and Sony T608? Size matters. There are a gazillion cheap, off-brand models on ebay but I have no idea which ones (if any) actually work.

I had been looking with interest at the Kensington model because it seems nice and compact and I’ve had nothing but success with Kensington products; but the reviews all warn to stay away from this puppy.

The Linksys model gets good reviews, but I’m not so sure about that little antenna do-dad.

The laptop has a PCMCIA slot and an SD slot (though I’m not 100% sure it is SDIO), so I guess PCMCIA and SD card options are worth looking at too. I didn’t find any good candidates in my quick searches though.