HTML5 Website Layout Tutorials and Inspiration
Here is the tutorial to learn some new techniques for HTML5 and CSS3 like Letterpress line with CSS text shadow, rounded corners in navigation and main content area, gradient effect with CSS3.
This tutorial provides some nice techniques for rounded corner, gradient effect and also it will show you how HTML5 will save your time while documenting your HTML file.
Smashing magazine gave this awesome tutorial on HTML5 Layout since a long back.
Another tutorial on HTML5 and CSS3.
HTML5 Websites for Inspiration