Mostly on my Nokia N8 and on my room's stereo system (both with speakers and headphones, depending on the moment and the mood). If I had (or when I have) a car, lots of music will be sounding all day long of course
Came across a U2 radio, which is a great thing, imagine U2 24/7!
I used to listen to it in the evening with my headphones on. http://101.ru/?an=port_channel_wma&channel=109&bit=2
I love the element of surprise and other things that I've never heard before.