Torchlight, surpassed a million units sold across PC, Mac and Xbox 360. The company didn't provide a breakdown across platforms, but the title launched in October 2009, May 2010 and March 2011 for PC, Mac and Xbox 360, respectively. Torchlight has been discounted several times over that time to help it along the way to the million mark.
Runic is currently working on Torchlight 2. Checking in on the game's ever-shifting release window, a company representative informed us today that the developer is "still targeting 2011," but no launch date will be announced until Runic is "closer to being done."