After two weeks of use, I've set my Magic Mouse aside and put my Logitech MX Revolution mouse back into service. You can read about my reasons here: http://bit.ly/8owUDZ
I bought my Magic Mouse yesterday. Same thing. Download and install the WirelessMouseSoftware update (twice) and restart. Pair the mouse successfully, but no gesture options in the Mouse System Preference.
Also ran USB Overdrive uninstaller. It reported that USB Overdrive was not...