And a great book it is. It sets out the basic prinicples of guerilla warfare, and links them to socialism in agrarian societies, the fundamental one being that no guerilla warfare campaign can be successful without the support of the population. The version i've got also tells of how Che's book has influenced revolutions in the other latin american states.
www.che-lives.com has a decent bit on him, including video and audio clips, aswel as the first chaoter of the book already mentioned.
Che was the greatest man of the 20th century. Easy.