To organize the text, I used H2 for main sections and H3 for sub-sections. H1 was too close to the post title size.
The H2 sections show strange artifacting: http://numbertheory.wordpress.com/2008/06/06/experiment-1/. The words "Quotes" and "Testing" are in Heading 2.
I don't understand how the layout engine or the HTML work well enough to figure this out. Any help is appreciated.