Ever been standing in a store wondering if you could get the same product cheaper online or at another store?
I just found a great new mobile website mobile.barcle.com that lets you search for an SKU or product name and get instant results including what the competition is charging for a product. Personally I have found that searching using the SKU is much better but you can also search by a product name such as a Canon SD1000.
The service is free but I found it interesting that even though it does allow you to compare prices it does not have links to the website where you can buy the product at that price. Hopefully that will be fixed in later upgrades. Personally I am waiting for Pricegrabber and Froogle to create mobile versions of their sites. There is also a desktop version of Barcle but it does not compare to Pricegrabber or Froogle.