I was able to get a Bluetooth mouse working with the ADV3500PC yesterday.
I purchased a refurbished Targus AMB01US at Micro Center this weekend for around $10 (originally $60). I didn't bother using the supplied Bluetooth dongle--the built-in BT on the ADV3500PC worked perfectly.
Also, I was able to pair the ADV3500PC with a Gateway laptop via Bluetooth to share an Internet connection.
For specs and more about the mouse, see
http://www.targus.com/us/drivers_man...sp?sku=AMB01US.