Smiley Extender

Smiley Extender allows you to send all hidden smileys of Yahoo Messenger version 7 or above. Just run this software and you will see a window with ALL the yahoo smileys listed. While Chatting, click on any of these icons and the corresponding code will get pasted in your last open YM window (any text window would do.) Later versions will have support for many more messengers and also for custom "frequently" used texts.