The iTunes Store realizes the promise of mobile commerce on handheld devices. The program is beautiful to look at and easy to use. It integrates itself seamlessly into your normal iTunes experience. That being said, it is admittedly a contrivance to sell you things. But these are things that you presumably want and can use while on the road. Stuck at an airport or a coffee shop? Download some new music to enjoy, catch up on last week's episode or your favorite TV show, or watch that Hollywood blockbuster you never saw in theaters. Yes, the iTunes Store is a point of sale, but it's also a fascinating place to spend some time and an interesting application for your iPhone.