Alright, so technically all video games are digital, but what we're talking about here is the stuff that you don't buy on physical media -- downloadable games, add-on content, mobile apps, subscriptions, and gaming on social networks. That market has grown to account for 24 percent of all video game revenues in 2010, or $3.8 billion, according to the Entertainment Software Association. The ESA is the body running the currently ongoing E3 shindig, and its data comes from the NPD Group, which likes to keep a cold robotic finger on the gaming industry's pulse. Other findings in the latest ESA study include the average age of gamers (37!), the best-selling genres (action with 21.7 percent, followed by sports at 16.3 percent), and the highest-grossing games of 2010 (no prizes for guessing the warmongering winner of that one). Give the source link a bash to immerse yourself in even more gaming trivia from yesteryear.