No I haven't been pumping my right side (the side he doesn't prefer). We had him on formula for two days while I took an antibiotic for an infection, and I pumped then. But I haven't pumped since because I thought it depleted the supply if you pump too early.. now I'm paranoid! hehe!
That side doesn't get too full, really... When I was pumping I would get about an ounce more out of that side than I would from my left side than I did from my left side. And now it doesn't really fill up to the hard-boob, leaking milk stage.

He eats some from my right side, but not like he likes the left. I try to start him on my right side.
Now I'm just rambling. Now that I know it's ok that he doesn't eat as much from my right breast, here is my other question-- Is it OK that my breasts don't fill up with milk anymore? Until a couple of days ago, they would fill right up, especially between pumping (when I was only pumping). And now they are still.. uh.. soft and floppy even when he's ready to eat!
It seems like he is getting enough, so I'm not too worried. But I hope that the two days of pumping didn't deplete my supply!!! Is this normal?