I remember that HD2 had the best development for any phone even at this time. It originally came out with Windows 6.5, and was the first phone with a 4.3 touchscreen, and a 1GHz processor. The only problem with it was that it was running Windows 6.5. And since it came out before the Nexus One, it was the most powerful phone so it attracted tons of developers. It now is able to run Windows 7.5 Mango, Android 2.2/2.3, and now the developers ported Android 4.0 Ice Cream Sandwich to it. Pretty amazing for just one device.