An Introduction Into WordPress Actions and Filters

Thanks to Gennady Kovshenin for the awesome, thorough article on WordPress Actions and Filters. I would say it gives you about everything you need to know. Thanks man!

Smashing Article on How to Convert Static Sites to WordPress

This article from Smashing on how to move from a static site to a dynamic WordPress one is worth a read. It's pretty in depth, but that's necessary to give a practical example of the actual migration process.