You can now easily buy your music from Amazon directly via your iPhone or iPod touch, thanks to Amazon's web app announced last week. You simply point Safari or any other web browser at amazon.com/mp3, and a new site optimized for your device will appear. You can access Amazon's catalog of 22 million songs and take advantage of deals that are often better than you can find in the iTunes Store, such as albums for $5 and songs for $0.69.