I crack everything, all the time. My knuckles, my knuckles again in a different way, my wrists, my elbows, my shoulders, my back/spine, my neck in different ways, my ankles, my knees (painful as all hell), my hips pop ocassionally, my toes, my jaw, I used to be able to crack my nose because I had damaged it (it finally healed and now I can't), my ribs seem to pop sometimes (it could just be my imagination, but I doubt it), my thigh bone's has to be strech-cracked every hour or so so I can continue to be able to move, and more I can;t think of.
Also, when I wake up, my cracks are so loud I actually woke up the person in the room next to me once. I muffle my morning cracks with pillows now.