The MoGo Mouse looks like a PC Card, but flip down the stand and you have a two-button mouse. We used Microsoft's Bluetooth stack to test it and had no trouble getting it working.
The mouse is responsive, although there's no touch-sensitive scroll bar. You charge it by plugging it into a spare PC Card slot, but you must have your notebook turned on for it to receive power. The first time you plug it in, Windows tries to install drivers and you have to cancel the operation.
The MoGo Mouse is expensive, but worth it if you want to travel light.