Speaking only in terms of full games, not "paid downloads" (like DLC packs for Black Ops) and PS Minis, the list is a hodgepodge of nostalgia-fueled favorites from yesteryear (like Tetris in its curiously lofty number one spot), and digitally distributed future-classics like Castle Crashers and Limbo, which ranked in at six and seven respectively. There's on important thread tying those together: none of those games launched in 2011.
When all digital sales are taken into account, however, the list becomes an entirely different beast, and the only actual game present within the top 10 is Angry Birds, of all things (a PS Mini). In fact, the three best-selling anythings on the PlayStation Network in 2011 were Black Ops DLC packs, followed closely by a cavalcade of FIFA Soccer 12 and MLB 11 sundries. At least the DLC came out in 2011! Hop past the break for the full breakdown of both lists, care of Game Informer.