Apple's dominance of the tablet market may be on the wan, as Android-based tablets are said to make up nearly half the market. This according to a Pew poll out recently showing that, among US tablet owners, 48 percent own a tablet running some version of Google's Android operating system. This latest figure represents a considerable loosening of Apple's grip on the tablet sector, and it does not yet take into account a number of other devices that may loosen that grip even more.