NetTuts has an outstanding collection of HTML 5 Tutorials organized into a 14-article Session:
HTML5 has been the buzzword with the web development community for a while now. If you feel a bit overwhelmed and behind the pack, never fear. This session is all you need to get up to speed, fast. We cover everything from the new HTML5 elements, to microdata, to the new JavaScript APIs.
See the full article: HTML5 and You | Nettuts+.