I bought a second Logitech MX Revolution on eBay (refurbished) to have one at the office. Problem was, it didn’t seem to work when I plugged it in. Luckily Brian had already figured out the problem when he’d gotten his, so he was able to tell me to use a Windows box to go through the steps to connect the mouse with the USB dongle:

Impressive, no?

Of course, these didn’t work on the Windows box at all, but did on the Mac after a half dozen or so tries.

I also recommend SteerMouse (thanks Sean) over USB Overdrive for the MX Revolution as SteerMouse supports the little zoom button by the scrollwheel and USB Overdrive does not.