Amazon took it's time with its latest Kindle-and that time has paid off in spades. Fully a year-and-half after the Kindle 2, Amazon today introduced its latest iteration Kindle, and the improvements are dramatic. An enhanced display, faster navigation, and an entirely redesigned chassis aren't all that set this Kindle apart from its competition. Amazon is continuing to be aggressive with its pricing: the Wi-Fi and 3G version will cost $189, while the Wi-Fi-only model will cost $139 (that's $10 less than Barnes & Noble's Wi-Fi-only Nook).