Analytics company Flurry has published an interesting study involving Android, iOS, and the U.S. video game market. Following up on a report from 2009, the company notes that the two mobile operating systems accounted for 8% of all U.S. video game sales in 2010 when calculated by revenue. What’s even more interesting is where both Android and iOS are taking their share from: portable gaming players. Console software revenues grew by 5% from 2009 to 2010 — 71% to 75% respectively — with portable gaming systems (e.g. Sony PSP, Nintendo DS) revenue falling nearly 8% in during the same period. Combined, Android and iOS accounted for 34% of all U.S. portable gaming software revenues — behind the Nintendo DS with 57% and ahead of Sony’s PSP with just 9%. Portable game software was a $2.4 billion business in 2010, with overall U.S. video game software revenues hovering around $10.7 billion. “Over 2011, we expect to see continued and significant smart-device game growth fueled by the recent launch of iPad 2, iPhone coming into distribution on Verizon, the expected release of iPhone 5, a relentless expansion of Android devices by leading OEMs across all major U.S. carriers, and Google’s enablement of in-app purchase billing, a proven key driver in iOS game revenue,” reads Flurry’s report. Smartphones and tablets may not be immersive enough for the most hardcore mobile gamers, but they seem to be more than adequate for most.