A Mac OS X UI clone - in your browser! Totally useless, but a nice demo of what you can do in modern browsers (via Phil Windley).
This is a single archived entry from Stefan Tilkov’s blog. For more up-to-date content, check out my author page at INNOQ, which has more information about me and also contains a list of published talks, podcasts, and articles. Or you can check out the full archive.