According to the venerable NPD Group, video game sales in America weren't much different for 2010 compared 2009. With total sales of around $15.4 billion, purchases of physical software and hardware accounted for about two thirds of that - $10.1 billion. According to NPD, this is about 5% less than 2009's sales. (The other $5 billion is made up of DLC, apps, Facebook games and the like.)
Meanwhile, VGChartz indicates that worldwide sales declined 8% over 2010. PS3 and 360 sales were up this year over last, 11% and 37%, respectively. Microsoft's boost is, in all likelihood, due to the phenomenal sales of Kinect. Meanwhile, the DS and Wii dipped 22% and 14%, respectively - but still outsold all competitors. For raw numbers (and proof that Mario's still got it after all these years - combined sales of Mario games in the top 50 totaled over 30 million) click here.
There will, of course, be lots of hand-wringing over, and analysis of these numbers; however, it's important to remember that these are stats for old systems. Sony and Microsoft no doubt got a boost from price cuts and shaking things up (literally and figuratively), and some great software came out in 2010, but all the platforms on the market are old news now. 2010 was the fourth full year for the Wii and PS3, and the fifth for the 360. Meanwhile, total console sales were still higher in 2010 than they were in 2006 - over 83 million last year with a fleet of old systems compared to almost 62 million in 2006, with a raft of shiny new systems on the market. Historically speaking, this is the time in a system's lifecycle when we should know the name and specs of each hardware developer's new console (well, maybe not Nintendo's...), but instead, they're still selling tens of millions of systems and we're left speculating when the big three will start dropping serious hints.