A decent breakdown of which DOM features are available in which browsers. More reliable than user agent string matching.
a live example:
Hello! Good Site! Thanks you! xgmcgqvoppqp
Hi. My name is Jonathan Snook and this is my site. I write about what interests me, which is usually web design, development, and technology.
I wrote SMACSS. I tweet. Want to learn more?
© Jonathan Snook • I think you're awesome.