Interesting letters aren't written by people who start out with the "I'd rather be shot than write a letter" attitude. There are so many opportunities and possibilities in letterwriting. You can write a "line," carry on a conversation, go in for chummy messages, or tell a corking good story. Rules, though, come in handy, for you can't always tell how the story's going, and a few do's and dont's should help you come out on top in writing letters.