You can search by EAN, EAN.UCC, GTIN, SSCC[?] and GLN[?] numbers or by company name in some countries. Results can be returned in HTML or XML for some countries.
The service is provided jointly by different national EAN-issuing bodies. It isn't fully working yet, but it is usable.
The service can be accessed at http://www.gepir.org
wikipedia.org dumped 2003-03-17 with terodump