[3rdEye]

I'd probably raise the size of the pot. At worst you're a coinflip, and at best you're way ahead (I guess if he has a straight flush draw you might be a slight dog, but I'm no good with Omaha odds). I don't think it's bad to pot commit yourself here. After all, at this point, you do have the nuts. In addition, he very well could have something like AK or two pair, and given your failure to raise preflop, he might suspsect that such a hand is good. Of course, there are a ton of scare cards that could hit, and I can't say how I would proceed in the event that one of them were to fall. If a diamond or a straight card comes on the turn, what's your play? If you check, he's sure to bet. If you bet out on the turn, and he raises, your judgment has to come into play. A tricky player will bet/raise if a scare card hits, regardless of what he has. Without a solid read, it's going to be tough for you to proceed in that event.

That being said, I don't think you can just call here. You're getting "Sklansky bucks" with every dollar you put into the pot on the flop. If your bankroll allows it, get as many of your chips in on the flop as you can.

Just my opinion.