Product review (5 stars): Miracle Tool
This little tool is incredible.  My garbage disposal was totally broken - when I turned it on it would emit a hum, but not spin or grind anything.  I couldn't find the source of the jam even though I tried to clean it out a couple of times.  So I bought this little tool, stuck it in the hole in the bottom of the motor unit, wiggled it around for about 30 seconds, and it cleared the jam entirely.  It was easy as pie and my garbage disposal has worked perfectly ever since.  Saved me $75 calling a plumber.