Back right pocket
Ewww I cant stand a big ol thick wallet in my front pocket. I carry my cards in a money clip in my front right pocket. I used to carry my wallet in my right back pocket but I stopped due to it being a pain.
Font Pocket...just looks and feels weird to have something inside my back pocket when I sit down...lol
Front pocket sans wallet.
Backpocket I forget about things and tend to sit on them; as a soccer referee, my red card is rather bent in the general curvature of my... well, you know.
When I had my money clip, it was front right pocket (I miss it) but now I do back right pocket with my wallet. I'm super anal (no pun intended) about losing my wallet, so I'm always like touching my back pocket to make sure it is there. From a random bystander's opinion it probably looks weird, but oh well.
Front pocket. The only downside is that I have to put my keys in the same pocket, but the upside is that I don't have to sit down on a thick stack of cards.
Front Pocket - I only carry a little cash and a few cards and identification.
If any pick-pocket wants a piece of my action - they will have to deal with me face-to-face - and I will make a point of teaching them a hard lesson, and making sure that they are very, very sorry that they chose me.