This looks interesting:
Newmatica is a site for sharing information about consumer products ranging from groceries to sports equipment to books to consumer electronics — essentially, anything that has a barcode. Just type in the barcode that you find on the package, and then see if anyone else has left information about that product.You can subsribe to RSS feeds for the products as well. Want to track popular opinion about a Real Hero Warrior Sword, for instance? Or Metamucil? Now you can.