If the car is pulling to the right when you aren't using the brakes, I don't believe replacing the driver's side pads will fix it (regardless, I still believe brakes pads on a given axle should be changed together).
Fundamentally, either something is wrong with the alignment, or something is dragging. I can't think of anything else that will cause a pull when not using the brakes. Hmmm - If tire pressure is really low, it will cause drag. Have you checked?
Some things to try: Jack up the front of the car and spin both wheels by hand (tranny in neutral - chock the rears for safety). Do both seem to have about the same resistance? Do you hear anything that sounds like rubbing or grinding? For sake of completeness, do the same in the rear. There will be some drag from the brake pads - but it shouldn't be much, and it should feel about the same from side to side.
Was anything else changed when you replace the brake components? Anything hit or dropped that could affect alignment?
