SiriusXM.com is offering 1-Year SiriusXM Internet Radio Trial for Free when you enter promo code CHEVY1YR. This trial requires NO CREIDT CARD. Just a email, and you can make up and first and last name and use any US Zip code.
Signup Link – http://www.siriusxm.com/freetrial?campaign=CHEVY1YR
update : one year promo code has expired. Here is Signup link for 180 days ( 6 months ) http://www.siriusxm.com/freetrial?campaign=TALENT092012
It includes all the channels (Music, Talk, Howard Stern, Playboy and MLB. ), and even the On Demand Content. In addition to musics, Sirius XM has live baseball like the World Series, the NBA, stand up comedians, Howard Stern, CNN, etc.
This works only via Sirius XM Online and their Smartphone Apps. It’s not for your XM radio on the car. You can’t change your password that it gives you.
Links For Apps:
On Computer: http://www.siriusxm.com/player
If you want to use it in your car, and your car has a AUX port or Cassette Adapter, or if you have a FM Modulator adapter, you can plug it in via that way and get it in your car, via streaming it on the App.