I am thinking of getting XM radio, prompted by an offer to receive every major league baseball game. Have done some research online, hitting mostly links to the service itself -- now looking for input from anyone who has looked into or better yet used XM (or Sirius). I would like to be able to listen to it in the car or on the computer. They have an option of listening on the computer but I'm not sure whether that is all channels or just some of them. In the car, there seem to be quite a few hardware options. I already have a radio-CD unit that I am happy with, but don't think is satellite-ready. Do the add-ons integrate seamlessly or do they look like colostomy bags hanging off the dashboard? Any other factors I should consider? Thanks in advance for all comments.