Our kids like to listen to Kids Place Live on XM Radio, while we are in the car. At home we have purchased some kids music that we play in their rooms. The kids have started to get tired of the music that we have (and so have we.) We play Pandora on our Squeezeboxes, but unfortunately Pandora doesn't have children's music.
I was browsing the radio stations that we have on our Sqeezebox, and I found Y! Lil' Kidz Tunes. This is one of Yahoo's children's radio stations. The kids like it, I like it because I don't have to listen to the same songs over and over again.