I check prices on just about everything I buy on-line. There are a couple of on-line price comparison services I have found extremely useful.
Books - Best Web Buys (I usually end up buying at Buy.Com)
Restaurants - Zagat (I pay for the on-line membership)
Everything Else - Yahoo Shopping
Random but excellent - Consumer Reports (I pay for an on-line membership here as well)
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I have redesigned the website using Blosxom so it will be a lot easier to maintain. I also added in comment functionality. Please, use those comments to let me know what you think!