The Google Nexus One has been officially announced, ending weeks of rumors and speculation. This Android 2.1-powered smartphone has been designed around a large, high-resolution, AM-OLED screen, but also offers a range of other features, including a 1 GHz processor.This is the first smartphone to be sold under the Google brand. Other Android-based models have said they offered "the Google experience" and have had Google logo on them, but these all were sold under another company's name -- T-Mo...