Tweaknews published a review of the tiny Cirago Micro Bluetooth USB Adapter.

Quote from the review: "This USB Bluetooth adapter from Cirago may be one of the tiniest currently on the market, but it performed admirably and exceeded my expectations. Even with the devices in different rooms I had zero connection problems between the adapter and my cell phone.
The presence of other 2.4 GHz wireless signals in the house didn't cause any interference either. For a mere $25, you can't go wrong."
Read the full review on Tweaknews.

See also our report about the future of Bluetooth: Bluetooth Low Energy.