HTC is a big reason why Google's Android platform has been so successful in the smartphone space, providing the first real alternatives to Apple's iPhone. Can HTC push Android to the same heights in the tablet space? We're about to find out. Starting today, Best Buy is posting HTC's Wi-Fi Flyer tablet up for pre-sale, which will ship later this spring. This highly anticipated device runs Android with an HTC Sense overlay, and will retail for $500.