Everytime I think I've written something pithy and fun I find that Teresa Nielsen Hayden has written about the same topic with more style elegance and wit than I could ever hope for. If I didn't like her so much, I'd be putting magic marker mustaches on her photo ID.
The latest example: the slush pile and rejection letters. I think I'll start including this URL in every rejection letter I send. Every writer should read it. Yes, even you.
(Thanks to Jarsto for the link from the comments column)