Non-phones (inc gaming devices) accounted for 21% of US mobile ad impressions in March 2010

"Connected devices like the iPad, iPod touch, Sony PSP and Nintendo DS accounted for 21% of U.S. impressions in March, according to new data from mobile ad network Millennial Media. Smartphones generated 45%, and feature phones, 34%. Impressions on the iPad increased 713% in the first week following the Apple tablet's April 3 release, although it still only generates a tiny fraction of Millennial's traffic.
Apple devices overall generated the largest share of impressions across Millennial's network, at 40%. While the iPad has gotten off to a solid start with 450,000 units sold in its first few days, the much-hyped tablet still has a long way to go to catch up with the 85 million iPhones and iPod touches sold to date.
Among smartphones, the iPhone was easily tops in impressions, with nearly a 27% share, with the BlackBerry Curve a distant second at 6%."
Source: Millennial Media, reported by MediaPost, 16th April 2010