Generators
Abbriator cmjooonss.
Emotium generates emoticon packs for Adium.
Emotoquy generates emoticon packs for Colloquy.
Pedantifier lets you correct people in the most smug way imaginable.
YukariBoard lets you create Azu-flavored chalkboard writing.
YukariBoard Favorites contains the best ones I've seen. Yes, I look at them.