It's Windows Phone 7 time with the HTC HD7! Aaron reviews the HTC HD7, T-Mobile's first Windows Phone 7 device. With a 1 GHz Snapdragon processor, 4.3-inch display, 5.0-megapixel camera, Windows Phone 7, and 16 GB of internal storage, it's a direct competitor to the T-Mobile G2 and myTouch 4G. Is it worth buying? We'll find out. Part 1 of 2.