Originally revealed in a leaked company memo the day before its release, Sirius XM's iPhone application was released on June 18th, 2009. Sirius XM for iPhone lets you listen to the online audio streams of Sirius XM's combined range of programming on your iPhone, iPhone 3G, iPhone 3G S, or iPod touch.

The app itself will be free, but you'll need to be a Sirius subscriber ($2.99) for it to work. Unfortunately, certain programming available for regular Sirius subscribers will not be available for Sirius XM for iPhone: "Some select programming, including MLB® Play-by-Play, NFL Play-by-Play, SIRIUS NASCAR® Radio, and Howard Stern, will not be available on the iPhone and iPod touch. Listeners will continue to be able to access that programming through the platforms they are currently offered on." Sirius XM Premium Online is available for download from within iTunes and comes with a free 7-day trial.