http://yoast.com/blog-headings-structure/ A good read on how to organize your heading structure on your blog. h1, h2, h3, h4. You know they are useful, but here is how to make them really useful for the search engines.
Using HTML5 elements in WordPress post content – Nicolas Gallagher — Blog A great explanation on how to insert html5 into your WordPress post content.
Toolbox: An HTML5 WordPress Starter Theme A great base to start developing your own WordPress theme not totally from scratch. (tags: wordpress theme html5 development framework) Like it? Tweet it! A great tool to integrate a tweeting box into your blog (tags: anywhere plugin jquery development wordpress twitter)
Starkers HTML5 « Nathan Staines A great example of the implementation of html5 in a WordPress theme. It is a good place to start learning!