Following my reflexion on a wp cheat sheet (pissed off by the dissapearance of nuclearmoose’s wp-layout explained for dummies), I stumbled on the following:

• Secrets of WP Theming (part 2, part 3)
• WP Themes: 1.5 theme cheat-sheet
• 1.5 theme cheat-sheet is really a « build yourself a 1.5 WP Theme » step-by-step guide (via)
• Dissection of a WordPress theme (part 2, part 3, part 4) by UrbanGiraffe, who also wrote Installing WordPress on your own Windows computer
• LaughingLizard (Mark Ghosh) of Weblog Tool Collection has quite a lot of articles on WP Themes ressources, Plugins, Hacks & design (speaking of WTC, it can’t hurt to check his bloglist [scroll down to My daily reads]