What Happens to the Brain When You Meditate 13 years ago
The benefits of meditation is well documented. In fact, a Scientific American article published Oster's research papers on brainwave entrainment in aiding meditation way back in July 1973 - http://neuroactivator.com/blog/brainwave-entrainment/
There are dubious claims about the benefits of meditation floating around though. I've seen a business peddling a "meditation-based program" which claims to cure cancer. Made me sick to the stomach.