The FCC has finally approved the XM-Sirius nuptials, but first it added some conditions to the ketubah. From the Washington Post's account:
The companies must cap prices for three years after joining and allow consumers to choose the channels they want and pay less for packages of channels. Radios that allow a la carte channel selections will eventually be available for car dashboards—the largest area of growth. The companies said they would introduce radios that receive both XM and Sirius channels.