Centerpointe Research Institute 3 CDs $159
There is a consensus opinion that meditation is good for you, both physically and mentally. There is also a consensus opinion that it takes a lot of time and practice to be able to develop the ability to train yourself to move your brain waves from beta to alpha to theta to delta.
The folks at Centerpointe Research say they have a way to speed up the process: Their Holosync audio technology allows you to listen to CDs (wearing headphones, since the process depends on differing sounds to each ear) which stimulate the brain, and force it to move to increasingly slower meditative waves.
The beginning program, Awakening Prologue, includes a descriptive CD, but the real work starts with the second CD. You first listen to the initial half an hour track once a day. After two weeks you add the second half an hour track. There is a third CD that contains a track designed to put you into an alpha state, which they say makes learning easier, and a track to induce theta waves, which they say increases creativity.
We are not sure how you judge the effectiveness of a product such as this, nor what the exact effects, short or long term, are supposed to be, but we have several friends who swear by these CDs. If you are interested in meditation, or are thinking of trying meditation, Awakening Prologue should be of interest to you.