I listen to Sirius primarily in my car. On occasion, I listen to one of what was XM via the music only channels on DirecTV.
When/if Satellite goes belly up, there goes my access to new music. Otherwise, Ill just plug in my mp3 and listen to that. I never liked FM radio all that much, going back long before Satellite came around.
I use winamp on my computer (okay, so I could go to shoutcast radio), but I never really got into services like pandora.
The whole thing about playing pandora through there iphone in the car...As Ive never owned an iAnything (yet), I have questions about that. Not all that relevant, though. My next MP3 will (reluctantly) be the iPod touch. Continuous 3G connection on the iPhone is one thing, but plain ol' wireless in a vehicle via the iTouch? Not so much...unless you have one of those new vehicles that apparently have that feature.
And I just had to upgrade my radio too (it was five years old, the buttons stopped working). Atleast I got it dirt cheap at Circuit City. Oh well.