SimpleBits, SimpleQuiz
I started reading SimpleBits blog (Syndication links) to learn more about web design. The author has been running a rather interesting discussion and has modeled that discussion as a quiz called SimpleQuiz. The latest entry is entry XVII.
In this quiz, he proposes a number of formats for markup and his readers discuss the pros and cons of each approach. The entries are easy to digest and I'm sure you'll learn a thing or two about HTML.
If you want to skip the original blog-entry format, as the questions were proposed and go right to the original problem statement and the conclusion, go here.