Brian Clark of Copyblogger has a perfect post on
writing headlines for blog posts - and uses Cosmo as an example.
My favourite bits of his post:
Writing your headline first might not work for everyone, but you can get ideas for articles and posts by looking at compelling headlines and adapting them to match your topic.
Cosmo Headline - “Guys Spill: White Lies They Tell Women All the Timeâ€
Jim Cronin, dare to write this one?
Realtors Revealed: The Little White Lies We Tell Clients (And How to Stop)
Remember, I used to be a broker, so I’ll know if you’re holding back. :-)

perfect isn't it?
I personally find it helpful to start by writing a great headline - however, sometimes it is sooo difficult to come up with one!
What does everybody here think of this technique?