In the modern age, the closest many urbanite HDTV watchers have come to survival in the great outdoors is watching quasi-documentaries like "Survivorman" or "Man vs. Wild." While I'm a fan of those shows, there's so much entertainment mixed in that I'm not sure that I actually learn all that much. Enter SAS Survival Guide, an app for the iPhone and iPod touch. Based on the bestselling survival guide book written by John "Lofty" Wiseman, former SAS member and instructor, the SAS Survival Guide app promises the elite survival training techniques of Britain's toughest fighting force.