Apple in one year has already claimed almost a fifth of all portable gaming revenue for itself, Flurry found in a new study this evening. The iPhone and iPod touch made up 19 percent of portable game revenue in all of 2009 where it had claimed five percent just a year earlier. At the same time, Nintendo dropped slightly to 70 percent, and Sony's PSP had its share almost halved, plunging from 20 percent to 11 percent.
