Froogle, a price comparing system is beta running online, which is a new service of the Google.

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.