Cople

TinyMCE Smiley Button

A nice to have would be to turn the text in the wysiwyg to a smiley. EG. :) <- Would turn into the smiley image after a space is added. A client of ours wants this functionality so i shall send relevant code to do so once i've figured it out. :)

Does what it says on the tin.

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 
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Mood Personalizer

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

TinyMCE Smiley Button vs Mood Personalizer