Does anyone have any ideas on a easy way to get data on certain demographics?

For example if I am am advertising video games, and know that the demographics for most video gamers is usually males 25- 35. Do you have any quick ways to look up interests of the same demographics of people?

i ussually just guesstimate

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I know that MSN has a good tool for finding out the demos for a niche but I cannot find a good way to take a demo and get a niche. I am sure if there was a way to use this same data to reverse from I would probably get a book of data either way so it is back to a guesstimate.

Might want to try quantcast.com just look at some sites that have what youre selling.

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