U.S.
This is a list of Amazon products sorted by the number of active trackings. When in Rome...
Live Amazon price watch alert stats by camelcamelcamel (a taller bar means more price drop alerts sent that day)

Price history charts and price watch alerts for more than just Amazon products.
Straight from the Camel's mouth.
Disclaimer: Product information is updated as often as possible but is not guaranteed to be correct and should always be verified with Amazon.
Prices last updated 3 hours ago.It is currently Feb 08, 2010 11:50 PM.