I enjoy listening to Pandora. They have done almost everything right - easy cookie based registration (so that I need not login every time), making stations to play songs of my interest, asking whether I liked each song being played, cute UI etc.
But what I miss most is a percentage slider which would ask me the percentage of the songs being played to be from the artists/songs I selected. This because I sometimes find 8 to 10 songs in a stretch aren't from the artists I asked for. Agreed they are a radio station (and not my desktop playlist), the songs being played are similar ones to the ones I chose & there's the skip option too, but I would like to have more control on what's being played. Listening folks?