I've always thought that one really useful application for mobile devices would be to track your progress in the gym. Once packet data networks are up an running, you just launch your mobilefitness program, and then enter the number of reps/weight that you do on each exercise. The phone is small enough to take around the gym - in fact you need it anyway in case you get a call. This system would also allow you to enter your progress, along with weight and aerobic activities too. It should be a feature of health clubs. They could then weigh or check on your body fat level periodically against your plan. Now, if you really wanted to do this all the way, you could enter the food you are eating all the time too...with voice recognition inputs the system could just ask about the food during the day and you could tell it. Well, maybe that's going too far...