Tom Gilder's CSS pseudo-element tests (first-line tests; first-letter tests) were created to "inspire browser developers to fully complete their support," but also serve as an excellent resource for designers. We've talked about moving forward with CSS before and hope to see more designers talking about it in the future.
Also of interest, Joe Clark's book "Building Accessible Websites" is now available free online. (via Accessify)
If someone wanted to invent a serendipity machine, it might look a lot like the web.