Tablets are booming, right? Yes and no. IDC reports that 18.1 million tablets shipped in the third quarter of this year, up 264.5% year-on-year, although below IDC’s previous forecast of 19.2 million units. However, it thinks that 63.3 million tablets will be shipped for 2011 as a whole. In Q3, Apple’s iPad remained the 900lb gorilla in the market, accounting for 61.5% of all shipments – 11.1 million units. Android accounted for 32.4% of tablet shipments in Q3, although it’s highly likely that a higher proportion of those remained unsold on shelves compared to the iPads. Meanwhile, RIM’s BlackBerry PlayBook remains a big flop, taking a market share of just 1.1% in Q3. IDC thinks Android will do well in Q4 though. “Amazon and Barnes & Noble are shaking up the media tablet market, and their success helps prove that there is an appetite for media tablets beyond Apple’s iPad,” says research director Tom Mainelli.