I've decided to split this in the three categories I know.
Conditional pops: When I squat, my knees pop. When I stand up or stretch, my back pops. When I yawn, my jaw pops.
Unexpected pops: wrists; hips (and it hurts like hell)
Intentional pops: my fingers (as long as they haven't been popped within the prior 30 seconds or so); my ankles and toes; my shoulders during windmills
Some things to clear the air:
It doesn't cause arthritis. And yes, I often pop my knuckles in public, and I'll continue to do so no matter how much it bothers you.