UPDATE: Looks like the 1-year deal is now dead. You should be able to get 6-months free with this link.
SiriusXM is offering a free 1-year trial of Sirius XM Radio when you enter promo code CHEVY1YR. And the best part is that it does not seem to be geographically restricted, which means it works great in Argentina.
Simply enter a US zip code when signing up (90210?) and you’ll be emailed a username and password to access the service. (Please note that you cannot change the assigned password.) Then, sign in and start listening away.
The also have iOS, Android and BlackBerry apps and you can always connect that to your car stereo and have SiriusXM in your car too.
So, now you can get your music, Howard Stern, news, comedy and more. Unfortunately, the sports radio packages do not seem to be included in this offer, but what do you expect for free?