For safety reasons I don’t advocate listening to any MP3 player while cycling and I didn’t plan to use my ipod. I prefer to pay attention to what is going on. I got one for Christmas two years ago, but It was months before I found a real use for my ipod. (I had to go into hospital and being flat on my back and in pain required some distraction.)
Still I found that listening to music (at a low level) while cycling was a real boost to my sense of well being on the hills and getting home in the cold when I am a little tired after 8 hours at work.