Spice up your Instant Messenger by installing sweetim. It has emoticons, winks, sound effect, audible, and a short games compatible with some of the most popular client chat like MSN, Hotmail, Yahoo, Gmail, AOL, AIM. It’s free and you can download other available emoticon on their site.

To receive an emoticons both chatter must install this in order to see the emoticons you sent. However if it doesn’t work for your Yahoo Messenger I encourage you to install the latest version of YM for this to work properly.