I have built numerous websites using the Drupal content management system.  I have a fairly firm grasp of how the code behind Drupal works, especially after reading the Pro Drupal Development book.  However, I really want to understand the nitty gritty details of how Drupal works.  Therefore, I have decided to begin an in depth review of how the code behind Drupal works.  I will start at the very basic "index.php" file and work my way through the code.  I have no idea how far I will get or how in-depth I will go, but I hope that it will be a great learning experience for me as a Drupal developer.  Perhaps others can find some value in it as well.  I will put a post up on the blog once I have made some progress.Also be looking for updates regarding recent work on the Lindsay I AM website that I built on Drupal 6.