Actually, the NUMBERS of Android phones sold is STILL way small compared to the iPhone and iPod touch... what IPD and AdMob are reporting as surpassing the iPhone is not numbers of devices in use... it is the number of Advertising hits on websites being surveyed by those two organizations ONLY IN THE US out of all websites in the World. There are various reasons for the higher numbers of hits from the Android platform smartphones... but the primary reason is that many of the Android apps are advertising supported, where very few of the iPhone apps are... and even the AndroidOS, being Google, is advertising oriented... while the iPhone OS is certainly not.
The television and radio markets in the US are also advertising oriented. The European socialists might disagree, but the free market based advertising driven model seems to work just fine.
You can spin all you want, but these NPD figures in this thread, are NOT for devices in use or advertising hits. They are for actual Android smartphone US sales in the first quarter of this year, versus iPhone and RIM smartpone sales.
And NPD is about the most respected outfit in the country for measuring device sales. Just this Thursday, NPD will give is video game console and games sales for the month of April, like they have been doing for the past 15 years.