Have you used any of these services previously? What do you think? Will Internet radio replace broadcast?
I had not used any of these services previously; I use my iTunes or just go to a specific radio station online and listen to it there. Any of these options would be good, but I decided to test-drive Songza because I'd not heard of it before. Even as I'm doing this post, I'm listening to the 'One-hit wonders' playlist. As for whether Internet radio will replace broadcast...who knows? Maybe, maybe not. Depends on how technically savvy the user is, I guess. There are plenty of people who don't equate 'radio' with 'Internet',and there will always be the Luddites who will wish for the "Good Old Days."
Can you recommend any radio stations that you found?
I don't listen to many online radio stations because I do have my iTunes.
Any problems with any of this--technical difficulties, finding a station difficulties?
Nope, no problems. It's always nice to have new avenues opened up, though.