I just picked up the MacMice bluetooth mouse at Tekserve here in NYC. A link to the product page is here:
http://www.macmice.com/themousebt.html
I've been anticipating this mouse, because there's really not a large selection of BT mice on the market. Other than Apple's, I've seen maybe one or two others.
It has two buttons and a scroll wheel. It comes with batteries (woot), and is packaged much like Apple's mice, similar box, clear wrapping, etc. It is shaped almost identically like Apple's mouse, and uses the same kind of rocking motion to activate the buttons. The scroll wheel is completely smooth as opposed to using a slight click.
Pressing the 'Conn' button for a few seconds caused it to be instantly recognized and pair with my 17" Rev A powerbook. No drivers are required, and I can alter mouse tracking speed and scroll wheel speed. The mouse is not registered in the bluetooth section of the keyboard/mouse system preference. There's no battery strength indicator active under mouse.
Overall I'm happy. It was 69.99 plus tax. The clicking action has that dull sensation caused by the rocking mechanism, which I'm not sure I like, but to which I'm not completely adjusted. I love the feel in my hand. The smooth scroll wheel is very interesting, and I'm really liking it. I think I'm sensing a small latency when clicking that may be due to the wireless aspect, but it's not bad enough to outweigh the privilege of becoming almost completely cordless.