The number of mobile devices accessing Wi-Fi hotspots in the US grew by 79% in the first half of 2009

"Overall, the number of mobile devices accessing Wi-Fi hotspots grew by 79 percent in the first half of the year. While the iPhone and iPod Touch remain the most popular Wi-Fi enabled mobile devices, collectively representing 97.8 percent of all mobile device connections, the Palm Pre debuted as the No. 5 most popular mobile device in June 2009, just within the first three months of its introduction.
When looking specifically at the online audience in cafes and coffee shops, the findings reveal that people tend to use these venues as the extended ‘home office’ or ‘college library’ with 83 percent of users connecting locally in their own neighborhood. Additionally, 40 percent are business decision makers with management titles, 23 percent have C-level or VP titles, and 44 percent are in small- to mid-sized businesses, a traditionally difficult segment to reach."
Source: Press release from JWire, 31st August 2009