Portable computers like notebooks and tablets should make up 70 percent of computers in just two years, Gartner predicted today. The category was already more than 55 percent of the market last year but should keep growing through 2012 based on ultraportables and tablets like the iPad. Apple's device, along with other tablets and conventional tablet PCs, should help push the number of tablets on the market to to 10.5 million just this year.
