iPeeper

eye-peeper(noun); a person, usually in the workplace, who looks at someone's IPOD screen to see what it is they are listening to and then comments on it, or uses that information later for some other purpose. "Joe I-peeped me yesterday when I was listening to Black Sabbath, and then during lunch, joked to my boss that I listen to 'the devil's music'". "Hey, I don't mean to be an I-Peeper but I see we have a mutual Clay Aiken thing going on."