Analysts at Gartner have estimated that there are already one billion computers in use worldwide right now. That’s a big number, but it’s the estimated rate of growth in PC ownership that jumps off the page in their report — 12 percent a year. That means by 2014, they estimate two billion people worldwide will be able to leave bizarre comments on YouTube videos or press the autosum button on a spreadsheet. “Whereas mature markets accounted for just under-60 percent of the first billion installed PCs, we expect