I tried to use ASUS BT-211 Bluetooth dongle (Atheros AR3011) with Ubuntu 10.04.1 and kernel 2.6.32-25-server x86_64. I downloaded the latest module source code with command
git clone git://git.kernel.org/pub/scm/linux/kernel/git/mcgrof/ath3k.git
I also built and installed the ath3k module successfully. But when I insert BT-211 in USB the greyed Bluetooth icon appears on the upper panel with 'Bluetooth on' menu item also greyed and locked.