I covered the news that Sirius XM was developing an Android app a month ago, and it is finally ready for download here as an APK. The app is free to download from from Sirius here and you can try it free for 7 days. There are multiple choices for subscription services listed here under the Subscriptions Options button.
AndroidCentral notes that the app:
is easy to use and hangs out in your notification tray, so you can access it easily while you're off doing other things. About our only complaint is that it doesn't work in landscape mode, and the app itself is named "Online," which makes it tricky to find in your app drawer at first.
Strangely, the developers have a specific list of phones that will work with the app, instead of doing it by Android OS release. Here is the list from Phandroid:
Once again, you have to have the "Premium Online" package to make use of this app, and no, Howard Stern is not available with this service.
Phandroid mentions that for those using "a locked-down AT&T Motorola Backflip, you will not be able to install this app."
Image from AndroidCentral
Source: Sirius XM