Boost your brain power

I've often wondered if sounds at different frequencies and different lights / images could be used to stimulate the brain into different states, ideally to do useful things like increase intelligence; kind of like the lawnmower man but without becoming a psychotic nutter. :)
A company named "Volition Thought House" have developed a series of music CD's which are designed specifically for this purpose, they sound just like normal music CD's but have hidden frequencies which stimulate the brain.
Research seems quite positive so far and the pictures are pretty cool too.

At just under 90 dollars it's not cheap and I don't normally believe the hype on these kind of things but they have some pretty big hitters supporting them so who knows..

Make your own mind up here