Google is the world's number one favorite web search engine but there are a couple of cool things that only Yahoo! can do . Have a look:

2. Get Lyrics of any song or your favorite artist - Type madonna lyrics or madonna material girl lyrics
3. Specify the order of search keywords in queries - You want to search a web page where word A comes berfore B but not vice versa, then just put the search query in Square Brackets.
An Example : [Sylvester Stallone] - will only return web pages where the word Sylvester appear before Stallone.
4. Search your favorite websites form Yahoo! itself. - Type !wiki google in Yahoo! Search box to search Google in Wikipedia.com. Other popular shortcuts are !ebay, !amazon and !flickr. You can also execute these from the Firefox Search Box without changging the default search engine
5. linkdomain - An undocumented Yahoo Web search operator - Can you find the number of articles on Wikipedia Website That link to CNN.com ?
It's almost impossible to get this from Google but you can do so quite easily in Yahoo!
linkdomain:cnn.com site:wikipedia.org