Not bad at all. 5% of the 10 billion dollar US gaming industry is the iPhone app store. In comparison, the PSP controls roughly 2.5% of the Industry here in North America. It also may be some good evidence towards a future dominated by the digital download market.
Apple wrote:"With these figures, our main finding is that iPhone (and iPod touch) is a gaming platform to be reckoned with. Controlling 5% revenue of a $10 billion industry in just a year and a half is significant. From a market share perspective, console games lost ground to portable platforms and iPhone. While the downturn in the economy may have dampened sales of the more expensive console games category, there is no denying that iPhone has generated substantial revenue and entered strongly into a mature industry."
-Insert Inspiring Quote-