I clip in first with my non-dominant leg (left) - probably b/c it's easier to instinctively find the second pedal with my stronger leg. If I clip in with the right first the left takes forever to get right.

Clipping out...depends on where I'm stopping. I like to stay on the saddle at a light and put my right foot on the curb if it's close enough Otherwise the right side of the road slopes away farther so I put the left down.