Does any one know any free sites for brain training?

kongregate.com has a lot of "brain" games, strategy, logic, puzzle types which are for one aspect of "brain training" but really any kind of puzzle gamem gives your brain a workout. Google for crosswords (cryptic, simple, general knowledge, etc), suduko (the number puzzler game), there are hundreds if not thousands of websites that offer free games to test your brain just do a search for "quizzes" and a keyword such as "geography" or "math" or "logic" and off you go :)