PC makers may not be satisfied with Windows 8 hardware sales, but at least they needn't worry about Microsoft's Surface tablets swallowing the industry whole. According to AdDuplex, Microsoft's Surface RT only accounts for 6.8 percent of Windows 8/RT devices, at least among those that accessed the firm's cross-promotion ad network. That's still good for the top slot, however, with the HP Pavilion G6 proving to be the second most-popular device with a 4.2 percent share. The Intel Core i5-packing Surface Pro was barely a blip, ranking as the 52nd-most common Windows 8 device. Keep in mind that AdDuplex's stats...