I *think* it may be discontinued at this point as the Anywhere Mouse MX someone posted on page 1 looks darn similar, so that may be the newest incarnation of it.
It is a great multifunction, wireless mouse with amazing battery life (runs on two AAA's. The buttons are all fully customizable via Logitech's software and the micro receiver is tiny so it can stay in a usb port pretty much all the time.
I bought mine from BJ's Wholesale Club for ~$45. Just saw them on Amazon for $85 though so shop around.
Great mouse, its what I use as well.
I love the flywheel