As anyone who's glanced at my Twitter feed during the editing phase will know, I have a slight em dash problem. Like my other writing tics (I have a whole list), it's a problem I clear up during revision, and then I complain about it on Twitter.
Elizabeth Ditty, one of the Evil Cabal, just so happens to list improperly-used em dashes as a copyediting pet peeve. And so, to help us poor em dash addicts out, she blogged about the proper and improper use of them. Get thee to the post, post-haste, as not only is it a very helpful bl0g -- but I make a cameo.* I even have dialog! And it's quite appropriate to my character.
What are you waiting for? Get over there!
*Couldn't help myself. Had to use one.
If you don't feel that you are possibly on the edge of humiliating yourself, of losing control of the whole thing, then possibly what you are doing isn't very vital. If you don't feel like you are writing somewhat over your head, why do it? If you don't have some doubt of your authority to tell this story, then you are not trying to tell enough. --John Irving