Worldchanging.com reports on GreenScanner, a public free web-based database of consumer opinions, good and bad, of grocery products which you can access just by entering in the UPC code.

“It’s designed for use with network-enabled mobile devices, meaning that when you’re standing in the grocery aisle fretting over whether to buy something, you can whip out your blackberry and find out on the spot. You can also add your own ratings and commentary after you’ve tried something,” says the site.