Practical "Kakalogology" - An Evangelical Theology of Cussing

Alright, I've have heard it, read it, and at times used it (usually in thought form - Jedi mind tricks). But what is appropriate and proper usage/non-usage of cussing? I found an interesting article that served as an intro on the subject. Here is another site that deals more with the etiquette and manner of profanity (or lack thereof): "Cuss Control Academy." Which reminds me, why on earth did I leave the television on during the debates?