We just watched a sort-of documentary called "The Hemp Revolution." It looks like it was produced in the 1980s but it is really informative on the many, many, many uses of hemp. A source of Omega-3 oils, of protein, the best fiber for making clothing (from silkier-than-silk to jeans) and a great way to produce cellulosic ethanol. And it is illegal to grow hemp in the U.S. ... why???
(No, it isn't good to smoke. Hemp is different from marijuana.)
You've gotta see this movie.
NOTE: I say "sort-of-documentary" because it is really slanted toward the good side of hemp and doesn't give any information on the (there's gotta be) downsides of the crop.