Krav Maga and ring-fighting are not the same thing, but there's plenty we can learn from fighters. One of my favorite people to read is Jack Slack, a very insightful analyst of combat sports. I'd recommend reading any of his articles, but he recently started producing video and his first entry is on something we all need to understand: The Stance. Even if a boxer doesn't use the same stance that we do in Krav, understanding how fighters move their feet and shift their weight on strikes will make your striking tremendously better. Check out the video, and read anything you can by this guy.