People always ask me for a recommendation of which phone they should buy. The first question I ask them is which phone they were thinking of. Lately, when someone says "Droid" they really mean an Android-powered phone. Then we start going through the process of figuring out which carrier is best, etc..
As luck would have it, the folks at Google have just made my life easier with the Google Phone Directory.
The Google Phone Directory features a showcase of Android-powered phones and the ability for you to filter the phones by country, manufacturer, carrier, and compare them by features, technical specs, and more. It's really the best place to start and finish, when you're thinking about buying an Android-powered phone.