I would be weary of using a site like that in case they collect personally identifiable information. Many sites say they don't sell or give the info to third parties, but just because the rule is written, doesn't mean it is followed.
Basically any games that worked in Vista will work in 7. If you aren't sure, install the game anyway and try it out. If it doesn't work, remove it.
thanks, do you know if call of duty world at war works on 7