Diana K. Cury

Very simple pluing, no configs, no screens, just action! 
Simple Smilies add all WordPress smillies in comments form and a simple javascript let users click them to insert. 
This is a very light plugin, the javascript only loads when in singular/single contexts, also there is no stylesheets.

Simple Smilies

Let users insert WordPress smilies when commenting in you site.

quanganhdo

Custom Smilies (previously named Custom Smileys) gives you a chance to personalize your posts and comments using smilies of your choice instead of default ones.
Custom Smilies was selected as one of <a href="http://mashable.com/2007/07/24/wordpress-comments/" title="30+ plugins for WordPress comments" rel="nofollow ugc">30+ plugins for WordPress comments</a> and <a href="http://mashable.com/2007/08/16/wordpress-god300-tools-for-running-your-wordpress-blog/" title="300+ tools for running your WordPress blog" rel="nofollow ugc">300+ tools for running your WordPress blog</a>. These lists were conducted by Mashable, as of July 24th, 2007 and August 16th, 2007.
This plugin was first released in 2005 and it is now updated to be compatible with WordPress 2.3.2.
<h3>Troubleshooting</h3>
In case Custom Smilies doesn’t work well with your blog, make sure the <code>wp-plugins/custom-smilies/init.php</code> file is writable. CHMOD it to 777 or something like that.

Custom Smilies

Custom Smilies (previously named Custom Smileys) gives you a chance to personalize your posts and comments using smilies of your choice instead of def …

Simple Smilies vs Custom Smilies