A version of the noVNC client is available online here.
A convenient shortcut address is noVNC.com
It's not a real project until there are videos and screenshots.
This online demo plays back a recorded VNC session.
There are many companies/projects that have integrated noVNC including Ganeti Web Manager, OpenStack, OpenNebula, and LibVNCServer. See this wiki page for a more complete list with additional info and links.
A browser with at least minimal canvas support (i.e. not IE 6, 7 or 8).
Run a vnc server, run the WebSockets proxy, load the page, and connect! See the project README for more details.
You can download this project in either zip or tar formats.
You can also clone the project with Git by running:
$ git clone git://github.com/kanaka/noVNC