Last night Google publishes a press release named Froogle Local saying;
Today Google announced the addition of local merchants' content to Froogle http://froogle.google.com. By entering the item you're looking for and your location information, Froogle will show locations nearby that offer the product and pinpoint the stores on a map. So, whether a user wants to order it online or run out and grab it for a holiday party the same evening, Froogle can help.
I tested it out in my area, by doing a search in Froogle Local on DVD Players, pretty neat.
Currently, I have only found forum discussion on this topic at WebmasterWorld and I would like to pull out a quote from one of the replies for you;
This is the first step towards the nirvana of mobile consumer comparison shopping: 1. Point camera phone at product in store. 2. Phone scans UPC or takes pic and OCR's make & model number. 3. Phone finds nearby stores with lower price on identical product. 4. You pick store, your phone gives you driving directions to that store. -OR- 4. You still buy at the store you are in because the price difference isn't that great (or they provide added value).