When iPads are counted along with notebooks, ultrabooks and desktops, Apple's dominance in the tablet space pushes it to the top individual brand of computer maker for the second year running, going from a 17 percent share in 2011 to over 20 percent share in 2012. The increase and ranking are largely due to the 23 million iPad units sold in the holiday quarter alone -- along with just over four million Macs, the shipments accounted for 20 percent of total computer shipments.
