When designing and developing a Drupal theme it is often more time consuming for me to override all of Drupal's default CSS styles. So, after quite a bit of research I decided to make a simple solution for resetting the styles so I can really start fresh. I also found that if we just delete all of the styles Drupal and all of its modules set, we are left with some huge holes.
Below is some simple code to accomplish this in Drupal 6. Just copy and paste it in your template.php file.
function [THEME_NAME]_preprocess(&$vars, $hook) {
$css = $vars['css'];