Couple more:
AAAA batteries in a 9 volt cell:
http://www.metacafe.com/watch/360955/9_volt_battery_hack_youll_be_surprised/
8 watch/button batteries from a 12v battery:
http://lifehacker.com/software/how-to/get-eight-watch-batteries-from-a-12volt-battery-291068.php
I don't think you are guaranteed to get many small batteries from the larger batteries, but apparently many manufacturers use the above methods, FWIW.
Best,
Kurt