Be sure to snag the newly released SMC firmware update (v1.4f10) for your shiny (or matte) MacBook on this Apple Support page. Like all Apple firmware updates you must install the update and tell the updater to start the update process first thing next reboot. There are no specifics on what this update brings but bug fixes, stability and heat issues are probably a good bet. Update: The fan kicks in at a lower speed and fix the mooing thing.
By the way if you are ever in the Birmingham, Alabama area, the Courtyard Marriott has surprisingly fast Wi-Fi.