Frequent travelers come in many forms. The frugal guy who's always looking for a couch to crash on. The wealthy lady who cheerfully pulls out her plastic anytime she wants to go anywhere. And then there are the travel fanatics -- the "mileage geeks." This type is neither rich nor cheap, but man do they know how to redeem. They're often math whizzes, people who pay close attention to fine print, or have just invested a lot of time learning how to maximize companies' point systems. I asked a few of these mileage geeks for tips about how best to spend this inscrutable form of currency. Here the full article on USA Today.