I recently watched the History Channel video Armageddon Exploring the Doomsday Myth. It is two DVD's containing four programs that originally aired on the History Channel; Doomsday 2012: The End of Days, Mayan Doomsday Prophecy, Doomsday Tech, and More Doomsday Tech. I do not frequently watch History Channel programs because I do not have cable/satellite. If the programs contained in this collection were the only programs that I have watched on that channel, I would not want to.
The first program is not very informative and is extremely repetitive, there is maybe 15 minutes of actual discussion were you to remove all the repetition. It's also the worst of the four programs by far, the information given is one sided and not all that accurate. For example the internet-based prophetic software program is a type of search engine and the more people mention 2012 and doomsday on the internet the more the program is going to spit that out.
The second program was better than the first, it actually did tell somethings about the Mayans. Really the Mayan calendar is pretty interesting and it is very accurate. The program though mentions a lot of things that really don't make all that much sense. It claims that the Mayan calendar (one of them since the Mayans used three interlocking calendars) predicted specific events such as the American Civil War, the assassination of Lincoln, the social upheaval of the 60's, World War 2, etc. which the first thing that I wonder is why would it predict things that really have no link to the Mayan's or even the area in which the Mayan's lived. Sure most of those were big events in US history but there are many events as big or bigger happening elsewhere in the world.
Look at the wikipedia article on the 2012 phenomenon or type 2012 Doomsday on google and you'll get more information then you'd get from either of those programs (and much quicker).
The third and fourth programs are part of a series called Modern Marvels and were much better than the first two programs. They make mention of Nuclear war, cyber terror, genetic engineering, nanobots, etc. Talks about how technology is a double edged sword that can be used both for good and for ill. How the advances of technology has made it so that an individual can have the destructive power of a nation one hundred years ago. Makes mention of global warming and dwindling supplies (the amount of oil is limited). Does have some interesting bits of information but plays up some things more dangerous than they are. For example, the gray goo scenario in which nanotechnology goes amuck and consumes everything. I just can't see that happening. Where would the nanotech acquire the energy to do so and how would it fair against microbes and such that have been evolving for ages. Though many of the threats listed do have merit. Pandemic's very real threats. Genetic engineering of food, while I don't really see this as large of a threat as portrayed in the video, I do think it needs to be studied more. I don't like that everybody is basically the guinea pig for this. There has been problems for example allergies to the modified foods.