Things continue to look up for Sirius XM Radio with the continued success of its long awaited (and highly anticipated) official iPhone App on the iTunes App Store ratings.

After only twelve hours of download availability the App went on to become the #1 free music application for iPhone users, beating out such longtime favourites as Pandora and Slacker Radio. The App was also declared as the sixth most downloaded free iTunes App of all time.

Even with a lack of Canadian support (and a Howard Stern channel) it continues to appear that Sirius XM has struck a home run in the release of their official App.

Not too shabby, Sirius.

[Via Orbitcast]