From site:
I-Doser Labs is the leading producer of Binaural Brainwave CDs and computer applications. Using proven, scientific, and safe methods of synchronizing your brainwaves; a simulated state can be achieved through the use of our advanced audio CDs, or the I-Doser Application, and a pair of high quality stereo headphones. Our Binaural process has been refined with years of research and development. With thousands of satisfied users, the I-Doser Labs CDs, MP3s, and the I-Doser Application for PCs continue to lead the industry as the only safe and effective method to achieve a simulated mood or experience.
Recreational Simulation CDs and MP3 are collections of binaural doses on standard audio CDs or MP3s. Each audio track contains our advanced binaural beats that will synchronize your brainwaves to the same state as the recreational dose. Mixed with our advanced auditory pulses are soothing backtracks of ambient soundscapes to help the brain induce of state of mood lift, euphoria, sedation, and hallucination. I-Doser CDs and MP3s are also perfect for using with iPods, other MP3 players, or through a regular CD player.
I-Doser for the PC is the most advanced computer application available to achieve a simulated mood or experience through the use of binaural beats. Use I-Doser to play doses purchased through the I-Doser Store. Each dose is scientifically designed to give you the optimal measure of pure beats safely and effectively to induce state. Every download of the I-Doser application includes two free doses.
Well I have had this software for some time now and all I can say is that this shit works!, It might be a placebo effect but what do I know I´m no researcher it might also be what they say it is. I have had some wild times with this program and I have laugh my ass off from what I feelt using it. 
I also might add that it works great with meditation. Now since I´m a pirate, I´ll tell you where to get the software the non-payment way if you know how to use a bittorrent client, if you don´t then learn.
WARNING!
The following people should not use brain entrainment:
> People subject to any forms of seizures or epilepsy
> People using pacemakers
> People suffering from cardiac arrhythmia or other heart disorders
> People taking stimulants, psychoactive drugs, or tranquilizers
I updated this (11/10 -07) so here is a new torrent for the I-Doser Cracked + 81 Doses here.
Official site here.
More info on Brainwave Entrainment can be found here.
A guide to getting your dose to work 100% of the time can be found here.
