The latest mobile metrics report from AdMob shows the growth of Android devices and the increase in WiFi mobile Internet access. It also shows where in the world the now almost 80 million iPhone OS devices reside. Here are the top-level data and some of the familiar charts:

• In the US, smartphones generated 48% of mobile Web and application traffic  . . . up from 30% a year ago.
• The percentage of requests over WiFi in the US tripled in the past year . . .
• 50% of the unique iPhone and iPod touch devices that requested at least one ad from AdMob in November 2009 were located in the US . . .
• Japan, France, and Australia were the fastest growing of the Top 10 countries for Apple devices in 2009 . . . 
• The growth of traffic from Android devices has been fueled by the release of new devices . . . 

Finally, in the US market  -- at least on the AdMob network -- it's really shaping up to be a contest between the iPhone, Android and RIM; the other operating systems are really shrinking or being squeezed out. 

All of these data are qualified by the fact that this is a reflection of AdMob's network and not the "mobile Internet" as a whole; however the trends are going to be consistent with the broader mobile Internet.