Because I like a challenge, I decided to build my own Chrome OS image (using the invaluable build instructions) and then screencast the results. Chromium OS is most certainly a work in progress and is very rough around the edges. Some of the coolest parts of the video demonstration at today's Google event either aren't available in the current build or will only work if you are using specially optimized hardware (I was using a virtual machine). Still, it's exciting to see what Google has already created.
With that said, if you're interested in seeing the OS in action in a non-flashy demo setting, check this out:
Obviously, Chrome OS isn't much to look at right now, but the idea of having everything in the browser is a concept that might just make low-powered, lightweight devices really pop as a new device category. The potential is certainly there for something very, very cool.