Ever stand in a grocery aisle contemplating the unknown (and potentially unappealing) story about where a product comes from and what it contains? Given the deceptive nature of advertising and packaging, the best way to get a straight answer about a product is to aggregate the opinions of its users. Enter GreenScanner, a public database of consumer opinions about the environmental accountability of over 600,000 products.This is a great idea. The website is a little rough (well really rough) but it is good start. Check out the entry of Horizon Organic Milk. He has software for use with a palm, but it would be cool if it worked with camera enabled cellphones. This will be valuable if enough people enter quality reviews. Not sure if that will happen or not.