(photo from Discovery Channel)
This series has been really interesting, offering two different perspectives on survival skills in different situations. In each episode, the hosts of the show - Cody Lundin and David Canterbury - find themselves in the midst of a survival scenario, in a different climate, different terrain, and different resources available. They each have different skill sets that compliment one another: Lundin's expertise is in primitive skills, Canterbury is an army trained scout and hunter.
I've read Lundin's best selling books on survival: 98.6 Degrees: The Art of Keeping Your Ass Alive and When All Hell Breaks Loose: Stuff You Need to Survive When Disaster Strikes. Both were very down-to-earth, no-nonsense guides to surviving situations that anyone could very well find themselves in (i.e. hurrican Katrina).
Canterbury has also published a book that I will have to check out: The Pathfinder System: A Common Man's Survival Guide - another no-nonsense guide to survival skills.
One thing that I particularly like about Dual Survival is how in each episode, they demonstrate a different technique for starting a fire (some methods look a lot easier than others). In the last episode (Out of Africa), they actually made fire with a hand drill - probably the hardest way, but the only tool they had for that scenario was a machete, so that's what they had to work with. You can't know too many ways to start a fire...and you also can't know too many ways to sanitize water.
The dynamic between Lundin and Canterbury is also interesting. They often work as a team to figure out how to deal with each situation, but they sometimes disagree, which makes the show more realistic, especially since we are talking about life or death situations.
I recommend checking out the tv series or picking up any of these books as an introduction to basic survival.