Originally posted by noz03
Also on a flop like that they will only have you beat by a set and you should be able to tell when they have it.
OK, let me describe a hand for you! You are with AKs, you raise and get a limper. There is A85 flop, you check, he checks, there is 2 on the turn, you bet, he calls. What are you putting him on at this time? Because of your "slow-play" you have no feed on what is he holding, weak ace, strong ace, 8, 5, 2, 85s, 52s, 82s, A2, A5, A8, 88, 55, 22, AA, some other pocket pair??? Or, is he waiting for straight with 34, 67, or is he waiting for a flush if that one is the second of some suit! And if it is 22, as I imagined in this example, K hitting the river will take your whole stack!!! But, if you c-betted, if the villain is not a donking station, you would have won some 10BB... Much better then losing 100BB, right?
Also, c-betting when you hit and when you don't hit the flop is a great way of disguising your pr-flop hand. Always c-bet, unless you are playing some pre-flop passive and post-flop aggressive player, because he will float you, or when the flop simply says, DON'T BET! 
I hope this helps?
The thing is, be aggressive as much as you can, unless situation at the table calls for you to not be aggressive! Even if you had American Airlines on the flop like that (A85), still c-bet!!! It will be a great disguise, especially if you play with floater or set miner. Just imagine if another 5 turns and he is set miner, you c-bet, he'll pay! Or, check here if you want to slow-play, who knows what magical card villain can hit on the river and there is only combo of 3 hands that beat you!