eMarketer estimates the US tablet installed base will represent 7.6% of the population by the end of 2011, up from 3.1% in 2010. Smartphone ownership, by contrast, will reach 23.4% of US consumers this year, up 4 percentage points over 2010. Those who do have a tablet are eager to use them for shopping, according to the e-tailing group. One in 10 tablet owners reported using their device for browsing or buying online every day, vs. 6% of smartphone owners. They also made more purchases. Nearly one in four had made at least six purchases in the past six months, compared with 15% of smartphone users who had done they same. They were also much less likely to never use tablets for online buying. Get the full story at eMarketer