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Here's a great article on landing page optimization:
Here's a link to a very interesting analysis of the Facebook game FarmVille, which now has more users than Twitter. It discusses the aspects of the game that make it so addictive. I can see how some of these concepts could be applied to other areas:
If you want to get more traffic from google make sure to check out Google's Webmaster Tools.
There are a number of tools including an analysis of how your site ranks under various search terms.