Jack Shedd built software to train his mind to subconsciously count cards, as to build a "trained intuition":
I built a quick simulator in Cocoa that dealt cards from a shuffled six-deck shoe. As each card was flipped over, slowly at first, the background of the application flashed either red, for -1, or green for +1. At random intervals, the application would stop and ask me whether I should bet low or high. If I was wrong, it flashed and beeped like a expensive car in a hail storm. If I was right, it kept going. Over time it randomized its speed, so I’d never fall into an easy rhythm.
He was inspired by How We Decide, a fantastic book... that I need to finish up. Interestingly, a good portion of the book shows precisely why we are ill-equipped to gamble at games like Blackjack. I'd wager (har har) that Jack's method will take a bit more than a handful of trials to overcome these competing instincts.