Wow, this is cool — basically an automated grocery list maker. How it works:
1. You plug a barcode scanner into your computer (preferably one in the kitchen)
2. Simply scan the barcodes of any packages before you discard them.
3. Grocist looks up the product’s information from the UPC database
4. It keeps a running grocery list for you.
(Thanks a.wholelottanothing.org!)