Toshiba has previewed a line of MP3 music players that run on fuel cells powered by alchohol. The players won't be available until 2007, but will have run times that greatly exceed any battery-powered player--run times of 35 hours and 60 hours are quoted.
One of the biggest problems when introducing something new and unfamiliar is acceptance of the underlying technology. Starting with a youth-oriented product like music players will speed acceptance of fuel cells generally. This is just the first of many products that will switch from batteries to fuel cells. And remember that alchohol can be made from corn instead of fossil fuels.