I saw this great video (I don’t know much about the hosting website so it may be taken down in a few days) -
glumbert.com - Supermarket 2.0
It’s about applying the latest cool Web-Two-O- Ism’s to a Supermarket so we have - Tagging, Ajax, Commenting, Wish lists, RSS Feeds, etc. My favorites are the parodies on - Pandora style recommendations and Amazon style selling items that other people who bought the same stuff also bought.