webvan.com - too fat to leave the house? have your groceries delivered directly into the fridge

pricewatch.com and mysimon.com - web bots that search for the lowest prices online

amazon.com + (book search) - customer reviews worth reading

ebay.com - some people live for bidding wars

800.com and buy.com - DVDs, CDs, consumer electronics

bookpool.com - 40% off many programming books

costco (map) and traderjoes (maps)

ikea - the bay area store gets more visitors than disneyworld

central computer - downtown SF computer store