As you can see in the example above i was able to build my own search service using Yahoo API .
Many other things can be achieved using Yahoo’s API including :

  • Build a Flickr Application.
  • Create a Yahoo! Messenger Plug-in.
  • Create a Trip Planner Search Application.
  • Perform a Yahoo! Search with ActionScript 2 and ActionScript 3.
  • Use the Yahoo! Maps Flash API.
  • Create a Yahoo! Music Jukebox plugin.
  • Mash up the Upcoming.org API.

More APIs on :

* Flickr API
* Upcoming API
* del.icio.us API
* MyWeb APIs
* Answers API

You can also check the other PL/Techs APIs like PHP , all can be found on Yahoo DeveloperÂ