Here is the sorta-annual rules to making money by gambling on the NFL playoffs article by Bill Simmons. Some funny and thought provoking stuff. I especially enjoy the one about taking coaches into consideration:
"For instance, six years ago, I took Miami over Buffalo simply because I didn't want to see a spilt-screen shot and know that I gambled on the doofus (Wade Phillips) over the guy who looked like a real coach (Jimmy Johnson). Sounds stupid? It worked. Buffalo doubled Miami's yardage and dominated the time of possession ... yet they still blew the game with four turnovers. Go figure."