I like to bet more on the flop than the turn in relation to the pot. The reason behind this is that draws have higher implied odds on the flop than the turn. In normal raised pots I always at bet the pot if it's a drawy board.

In situations where the pot is very small (like if there are 2 limpers and I am in the BB) and I figure people are drawing against me, I will bet 1.5x or 2x pot on the flop. I figure that people will be more loose with their calls in these spots and I want to deny them any sort of odds to do so. I think that while implied odds are based on pot size, they aren't exclusively, and especially when I have a vulnerable but very solid hand that I would have trouble folding in later streets I think a small pot sized bet on the flop just doesn't cut it.

On the turn I will often bet 65-75% of the pot because I figure I need to bet less to deny implied odds. I also like this size on the turn because it allows for more maneuvering in a pot that is getting pretty big in relation to stack sizes. If I am ahead, it's often pretty easy to get more money in, if I'm behind it's much cheaper than betting pot again, and I don't want to be pot committed if I'm likely behind.

This has to be sometimes the same as when I am betting my draws or air obviously, I don't want to be transparent. Maybe not always though.