If a retailer wants to see how people are ‘tagging’ their site all they need to do is go to delicious and search for their website. Some interesting examples-
Bluenile.com – This designer believes the site is ‘riff’ worthy. Quite a compliment.
Gaiam.com – Has Gaiam considered marketing themselves as a fair trade retailer?
Underarmour.com – New product idea, for free!