Just a few snippets of code I've played about with.

Rush Discography
A pure CSS3 driven demonstration. Select an album in the navigation box and watch the page change. Completely JavaScript free, it is a single page using CSS to show, hide, and animate everything.
Flaming Text
Sample of multiple box and text shadows. Just hover over the copy.
Mosaic Overlay Test
A proof-of-concept for a company's homepage.
Media Queries Samples
Suite of three media queries tests. Designed to be a progression from #1 to #3 illustrating the basics of media queries and possible solutions to problems. Rethinking the Table (#3) provides one possible solution to rendering tabular data at various screen widths.