the round numbers thing is interesting...i noticed that my natural inclination is to bet some creative number (like 73 into 90$ pot) when I'm running a bluff. I think it's because I want them to think I am paying attention to the hand (i.e. I must have it!) but that probably works against me since you pay more attention to your bluffs than you do the nuts. This MUST be the sole reason i'm not playing 25/50.