As you can see, when you find someting in it, you can find
1) product and picture (submitted and crawled by google)
2) rank in price and search in a price range
3) Sponsored links, of course
In my memory, there're many sites running this service in so-called Internet Bubble period, most of them maybe not running now, and google take advantage of it's search tech, take a position in this area (maybe that's why not yahoo, MSN, or Amazon.)
If you're wondering how many techs Google has, you can take a look here- Google Services, and there're more fun and interesting serive in Google labs.
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