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http://drupal.org/theme-guide

http://drupal.org/getting-started/6/install/multi-site

Anatomy of a Drupal 6 theme
http://drupal.org/node/171194

Structure of the .info file
http://drupal.org/node/171205

Theme HowTos
http://drupal.org/node/22803

Clearing the theme cache
http://drupal.org/node/337176

Safe theme development
http://drupal.org/node/336813

Theme coding conventions
http://drupal.org/node/1965

Totally customize the LOOK of your front page
http://drupal.org/node/317461

Create a CSS-Only Theme
http://drupal.org/node/394612

Adding style sheets
http://drupal.org/node/171209

Standard Drupal core styles and classes
http://drupal.org/node/388372