I'm a former blackjack dealer, so figuring the pot even in a NL game isn't too difficult for me, thankfully (even scattered about it's not too difficult once you're used to it). Being a former dealer has the added benefit of being able to know exactly how many chips everyone has, which can be useful.

The odd thing about pot odds for me is that I actually have more trouble doing it online than in B&M because I tend to run out of time online. Of course, I keep getting hammered in B&M, but I have a feeling that doesn't have anything to do with my pot odds calculations....