Series Introduction to Widgets - overview

This is my plan for the Introduction to Widgets series. Every bullet point should become one article.

Please let me know if I’ve forgotten a subject, plus anything else you can think of. We also have to decide where these articles are going to be published.

I’m also looking for nice case studies.

What order should the articles be in? Intro comes first, config.xml second. But after that? Which article would you yourself be most interested in reading?

As a rule, one article will cost me about 1-2 days.