Google more and more features...

Google has added more search by number features:

Area Codes, e.g. 650, bring up maps.

UPC codes, e.g. 073333531084 or 036000250015, bring up some information about the product.

Flight numbers, e.g. usair 50, provide links to flight tracking

Vehicle ID (VIN) numbers, e.g. JH4NA1157MT001832, link to a CARFAX report on what kind of car and its status.

U.S. Postal Service tracking numbers link to package status.

Source: Google Weblog