In David Sklansky's book, The Theory of Poker, he had a section on randomizing your bluffs. He said that instead of trying to figure out when you should bluff, just select a hand ahead of time and anytime you recieve that hand you make a bluff with it.
Ironically, the hand that I chose was 72 suited. Because I already have it programmed in my head that I'm going to play this hand, I always play it like it's a pair of aces. I usually raise preflop, and then bet on the flop no matter what comes out. If someone calls my raise and my bet I usually slow down on the turn and don't risk anymore $ in the pot. This strategy helps me not look too tight when I'm at the table.