WPDesigner » So you want to create WordPress themes huh? -- This is the most updated tutorial for making Wordpress theme I guess. And it explains clearly what to do. I find it easy to understand. The main site of
WordPress › Blog Tool and Weblog Platform gives a tutorial as well in their Docs.
If ever you are having a hard time creating a Wordpress theme, just use a premade one that few sites are giving out. That what I'm doing for now, while my own theme is still under development.