Nazmur Rahman

TinyMCE Emoticons plugin helps to add emoticons in posts and pages easily.
Features:
<ul>
<li>User can add emoticons from post and page screen using TinyMCE Emoticons button.</li>
<li>Three different emoticon sets has been added (basic, animated, outlined).</li>
<li>Any one of the set can be selected from plugin settings page.</li>
</ul>

TinyMCE Emoticons

TinyMCE Emoticons plugin helps to add emoticons in posts and pages easily.

Ciprian Turcu

widget that you can place in your sidebar and that will show the blogger current mood by selecting one of the 12(so far) emoticons available. 
You can select 4 different sizes, depending on the size in width of your sidebar(so it fits just right).
Update 1.1: 4 more emoticons added 
Update 1.2: Dynamic Title(changeable from widget page) 
Update 1.2.1: Fixed a small design issue and aligned mood icon to center 
Update 1.0.1 Small other important design issue 
Update 1.2.3 Small admin_menu fix for wp 2.8.1 
DONATE! <a href="https://www.paypal.com/cgi-bin/webscr?cmd=_s-xclick&hosted_button_id=8322585" rel="nofollow ugc">DONATE HERE</a> – (any ammount using paypal or credit card)

Mood Personalizer

Widget that you can place in your sidebar and show your current mood.

TinyMCE Emoticons vs Mood Personalizer