New research on Smartphone Adoption & Usage from the Pew Research Center's Internet & American Life Project May 2011 study.
35% of American adults have smartphones. That means 65% do not own a smartphone. Those numbers will change over the next few years but, in the interim, don't leave the majority behind.
Some key findings:
1. Smartphone adoption is highest among the affluent and well-educated, the (relatively) young, and non-whites
2. Mobile phones are a main source of internet access for 25% of the smartphone population
3. Android is the most common smartphone platform, followed by iPhone and Blackberry devices (tied for second place). Surprise: Palm devices are in third place, ahead of Windows Phone.