I learnt about Arbitron last October when I met their UK Director. Arbitron Mobile is an on-device measurement app that sits in the background and records nearly every interaction a person has with their smartphone. It covers all the main operating systems (iOS, Android, and RIM). The App is downloaded by opt-in panelists recruited through email or SMS campaigns, for custom or syndicated projects. For example, the UK panel consists of 5000 users. Arbitron’s clients have access to consumers 24/7 context, behaviours and opinions.
Arbitron have a recent press release that looks into gaming in terms of time spent, popularity by platform and how often/long games are played on the various operating systems.