The difference between a Designer and Developer, when it comes to design skills, is the difference between shooting a bullet and throwing it. — Scott Hanselman
UPDATE: Calm down everyone, I didn't mean to be snoddy. This quote also works the other way around, at least what I am concerned regarding my development skills. And of course, there are developers out there that are fantastic designers. I was taking this quote much lighter than most of you. I just thought it was a funny analogy.