The Design List

Written by Themetation, this is a three part series that takes a theme writing process from scratch and translates to a WordPress Theme.

Discusses all aspects including Slicing and Dicing, Saving for WordPress and the basic styling of CSS Stylesheets for use with WordPress. It also tries to explain the basic components of the WordPress Site and explains each page as required.

A good resource to start with.

Source:

http://themetation.com/2008/07/14/how-to-create-wordpress-themes-from-scratch-part-1/

http://themetation.com/2008/07/15/how-to-create-wordpress-themes-from-scratch-part-2/

http://themetation.com/2008/07/17/how-to-create-wordpress-themes-from-scratch-part-3a/

http://themetation.com/2008/07/17/how-to-create-wordpress-themes-from-scratch-part-3b/