They may literally be the best thing since sliced bread, for hunters at least. Trail cameras act as high-tech sentries, allowing us to maintain 24-hour surveillance on the deer we plan to hunt so we can get a little sleep, catch a little Sportsman Channel and maybe spend a few hours with the family before the season launches. More compact than ever and with faster-firing triggers, today's units are much easier to use, too. Trail cams allow us to inventory the deer on our land and monitor movement better than that stalker ex-wife of yours. Each of these units will help you become the ultimate woods-roaming voyeur.