This was going to be an edit, but I got typing happy -

You can prevent URLs from auto-linking by selecting "Go Advanced" when creating a post. Under "Additional Options," uncheck "Automatically parse links in text". You can also disable smilies in a post by doing the same thing, but checking "Disable smilies in text" so things like SW:D stay as Shadow Word : DEATH and not Shadow Word : HAPPY FACE...though they should totally make a glyph for that so you can make people die like The Joker.