Hello. In case you're planning to use Smilies Themer on WP 3.1.4, I'm telling you that it works great!
The only minus is that this plugin has a little problem if you're using custom name for your plugins or wp-content directory. I know this is a very little and very easy fix, but just in case if someone new is confused, here's some tips to make it compatible with your custom named directory:
Open your smilies-themer.php and find on line 37:
define('k_SMILIES_URL', get_settings('siteurl') .'/wp-content/plugins/smilies-themer/');
Change that to
Your plugin now should work functionally :)