I'm not sure that my reading has led me to what I was looking for but I did come across several interesting sites.
The Pew Internet & American Life Project, created in 1999 as a Pew Charitable Trusts’ initiative, the Project studies the social and civic impact of the Internet, arguably the most far-ranging, behavior-changing communications innovation since the invention of printing. The project surveys not only what people think about the technology but also how they use it: for example, to expand their educational and religious activities, learn about health care, engage in politics and build relationships with family and friends.The PEW Latest Trends pages provide recent statistics that might prove to be of interest.
I wonder if there is an equivalent project based in the UK.
As you might expect the Entertainment Software Association (again in the U.S. of A.) provide some interesting information about game players, and provide links to research indicating the benefits of game playing. I was taken with "the average game player is 33 years old and has been playing games for twelve years".
A little closer to home I came across the Interactive Software Federation of Europe.
More statistics with a European emphasis.
Check out the Digital Entertainment Facts, and the Studies and Reports.
A link from the ISFE led to this BBC commissioned report looking at UK residents and their gaming habits..