I didn't get a chance to check it out like I wanted (Wife was ready to go after meeting Lucky Vanous) , but at the Mid-American Trucking Exposition in Louisville in March, Delco had a pretty large booth dedicated to SDARS. Satellite Delivered something or other Radio Service
Several Large Truck mfrs. are supposed to start offering the radio as an option sometime this year. I have heard it is a subscription service, along the lines of DTV & DISHNET w/o the video portion. It is also supposed to be commercial free from what a DJ friend of mine on the left coast told me on TiVo message board.