HTML5 Audio and Video Guide
Published July 27th, 2011
Safari HTML5 Audio and Video Guide: About HTML5 Audio and Video
This is a good reference with lots of sample code for using HTML5 audio and video. The samples cover a wide range of possible custom applications. Though it's specific to WebKit/Safari, many of the CSS styles used for custom appearance are now supported by Firebox and, of course, Chrome (which is a WebKit browser like Safari).