[robertsonjohn]

In the second hand, why would you check the flop? With 2 diamonds on the board, don't you want to have him raise you and push out the other two (or at least pay 2 bets for their draw)? Plus, if he doesn't raise, you have more information about his hand and can now assume that a three on the turn won't counterfeit your 2 pair). Assuming he's aggressive (and he must be considering he raises 55 PF with 2 limpers ahead) and assuming he doesn't hit his 2-outer on the turn (which doesn't quite work this hand), you can just call his raise on the flop and then check raise him on the turn which nets you about the same amount of money as your flop check raise, but also protects you against the flush.