Brian at Copyblogger has some excellent posts about post headlines which have really impacted the way I think about them. He’s an expert at writing titles- when I visit his blog, and look at the popular articles section in the sidebar, I want to read all of them! He is currently in the midst of suggesting changes to reader-submitted headlines. The first collection is here: Headline Remix Madness – Part One | Copyblogger
He also has a series of posts entitled How to Write Magnetic Headlines that is a must-read.