Building a custom HTML5 video player with CSS3 and jQuery
Dev.Opera has a great tutorial on creating a custom HTML5 video player with CSS3 and jQuery that could help you build a very customized player for your web site.
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Getting Started with HTML5 Local Databases
Client-side storage is one of the most interesting features in HTML 5 and it has a lot of uses, specially for browser apps. If you want to start experimenting with local databases, Ben Lister came up with a great tutorial about this feature: Getting Started with HTML5 Local Databases.
Build Web applications with HTML 5
Michael Galpin, software architect on eBay, writes a detailed article about building applications with HTML 5, extremely useful for learning how to detect HTML 5 capabilities and taking advantage of them right now.
HTML 5 & CSS 3 techniques
Nettuts+ brings us a great tutorial to start working with HTML 5, with some cool CSS techniques to style our projects.