Google's Android operating system has come a long way in the past year.
A year ago, you had two choices if you wanted an Android smart phone, and both were offered only by T-Mobile. Since then, the Android ecosystem has exploded with options. Every major U.S. carrier now offers Android phones, and they come with a variety of features and in various shapes, sizes and prices.
I've been testing some of the latest -- Samsung's Epic 4G, Motorola's Droid 2 and Motorola's Charm. All share the same basic Android OS and some core features, but each is likely to appeal to different audiences.
