theming book

Hi all,
I've been trying to design my own theme. Can anybody recommend a basic guide to theming on Drupal 6 - the more basic the better. Idiot proof is best. Any suggestions welcome.
Cheers,
Damian

Hello, I'm just posting here to let everyone know that the bulk of the new theming handbook is up. Most of it has been rewritten and reorganized. I hope it is accurate and clear enough to get everyone familiar with the theming system.

It's still missing sections on sub-theming (which can get really fancy BTW). I hope to get a few solid explanations and illustrations on the possibilities. Engineless themes and theme engine sections are not there yet but I don't think it's too critical.

JavaScripting could use some help too. I hope someone can fill that in.

Drupal 5 Theming by Ric Shreves

If you are a designer wanting to learn Drupal, this book is for you. It is written by a designer so there are no programming sections full of code. It shows you how you can customize Drupal's HTML and CSS in detail. The book has a good amount of screen shots, charts, and other visual aids that really help the right side of the brain.