Something I've started doing is if I'm heads up going to the flop and last to act, I don't even look at the flop at all, rather my opponent to see his immediate reaction to the flop. Even if I completely missed the flop, I've found that if I can get a tell on my opponent as soon as the flop comes I can bet him out easily. This works also if your opponent is looking at you when the flop comes, because he won't be able to get a read on you yet, and he'll be forced to look at the flop. This can be a very annoying yet effective strategy.