I use one one occasionally, usually when I know that I am either going to be stuck in traffic or am going on a ride longer than an hour or two. I have the regular ear bud style ear piece headphones that came with my
mp3 player. They work pretty good, probably not as good as the noise cancelling ones that stick way down in your ear, but they are suffient. After placing them in my ears, I just have to be a little careful putting my helmet on and leaving a little slack on the cord for when I turn my head. When I wear my leather jacket, I keep my mp3 player in the inside chest pocket. When I am wearing my denim jacket, I keep it in the outside chest pocket.
Soren