Yahoo! has some interesting search technology that you don't hear other engines talking about. In the Yahoo! Search Blog, it's revealed that they not only analyze pages for ranking, but for useful units of information on the page. Essentially, for certain pages they will scrape identifiable content like a business address and list it out in their results:
"...a new feature in our abstract generating algorithm that tries to guess the most used information about that page, and promotes it into the summaries for search results. Not only do we try to figure out the most used information on the page, but we also integrate relevant features from other parts of Yahoo!."
