Not sure I stumbled on it by accident.
It may be sold here http://www.rovergolf.com/pages/power-drive-pro.html
and here is a video by another guy not sure if it is the same hammer swing http://www.youtube.com/watch?v=pBmCits5VVI
Jay Golden has been a PGA Member since 1982 and was selected for the PGA National Teaching Committee in 1988. He has taught golfers of all levels ranging from stark beginners to professionals on the PGA and LPGA Tours. He has written hundreds of instruction articles and a book with the all-time winningest golfer of official tour events, Kathy Whitworth, entitled “Kathy Whitworth’s Little Book of Golf Wisdom.” He has also made numerous appearances on TV, has lectured on the topic of “How To Teach Golf” to PGA Members, and is an accomplished golfer and long driver.
I think that is the guy on the video according to this website: http://www.expertvillage.com/video-series/5543_golf-hammer-swing.htm