A new study out today by Experian Consumer Research concluded there are differences between consumers who purchased the PS3 and those who purchased the Xbox 360. The biggest difference being that while the Xbox 360 appeals the most to gamers who are 35-44, the PS3 appeals to the more senior demographic of 45 and up. The study also finds that youngsters ages 18-24 prefer the Nintendo Wii. Finally, the study uses "new media respondents" as a control group, defined as those who spend more than one hour online per week.
This study doesn't tell us anything we don't already know; they don't state any specific numbers in their press release and the presentation you can download basically concludes that there are no differences between PS3 owners and 360 owners except for age. After seeing a sample of their rudimentary research, if we were a company looking for statistics to help us market to gamers, we'd stay away from them.