Jellos "grow more pot" spoken word is great, Im all for the re-legalization of marijuana and have read quite a few books the subject. Some of the stuff listed already here is just the tip of the iceberg. I own a copy of The Emperor Wears No Clothes by Jack Herer and have read it several times from cover to cover..tons of information on everything from how it can be used as a fuel to why it became illegal in the first place, and how it can reverse the effects of global warming. I definetly recommend picking it up.
www.jackherer.com