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.
Into Plugins? You Will Love This. three persons, carefully handpicked among all the three most important people in WordPress, are writing a book, I mean, THE book, on WordPress Plugin Development. These three fine chaps are Brad Williams, Justin Tadlock and Ozh.
Version 3.0 Launch! | Digging into WordPress The now famous book Digging into WordPress Version 3.0 is here and it’s packed with goodness, including a new chapter on WordPress 3, updated core content, and a super-sleek new cover.
8 useful recipes to improve your WordPress theme 8 small hacks to improve your WordPress theme