Bluetooth 2.1 dongles
At the BlueZ developer meeting in Portland a few days ago, Claudio handed me another Broadcom dongle that needed some quirks to make it work. To my surprise I discovered that this is a Bluetooth 2.1 capable dongle. This was the first Bluetooth 2.1 capable dongle that I have seen that you can officially buy. Previously I was using CSR BlueCore4-External based dongles and flashed new firmware into it.
It is a Targus ACB10US. They are really nice since they are tiny. The box and their website still says it is only Bluetooth 2.0, but it seems they ran out of these chips and started putting 2.1 chips into it.
Claudio bought his one at Office Depot in Portland downtown, but they ran out of stock. Today they got a new shipment and just bought all of them. Now they are out of stock again 
Also the Belkin F8T016 dongles have been reported as containing a Bluetooth 2.1 chip.