I absolutely love Copyblogger.com, in particular their series on writing good headlines.
The link above leads directly to the headline posts, which are priceless and also free. After I read those posts I went back to ezinearticles and fixed the headlines of several of my existing articles and resubmitted them - and DOUBLED the page views AND the clickthrough rates. Without changing the actual article at all.
Learning how to write effective headlines is an absolutely vital skill in the internet marketing world.