I stumbled upon this site while trying to find ways to cease my cracking.
My fiance is driven nuts by it, and absolutely can't stand when I crack my toes. All I have to do usually is just bend them in and they'll crack. I used to have to put pressure on them but now I can do it freely.
I also crack my knuckles, back, sometimes ankles (usually only my left one when it gets really stiff), shoulders, and neck.