Screeniac
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WishRadar is a service that keeps your Amazon wish list items on a price radar. It compares prices from Amazon, Amazon Marketplace, and half.com. Whenever the item drops below your target price you’ll be notified via email or sms.
Flash Demo

BidNearBy FindNearBy helps you find items you may be looking for in a localized search. Just type in what you’re looking for and your zip code and BidNearBy will search ebay, craigslist, amazon, and Wal*Mart.
update: I was just notified that the site is now FindNearBy. The domain BidNearBy still works however.
Flash Demo