Hey all. I released a new version of Coinmux that now has a graphical user interface. It still defaults to using the Testnet network, but you can now easily change that in the preferences menu if you are adventurous with your Bitcoin.
You can view an animated GIF with two participants mixing their coins on the Coinmux homepage
http://www.coinmux.com.
Here is a full-sized direct link to the animated GIF
http://coinmux.com/images/animated-coinmux.gif.
And of course, all of the code is available on Github at:
http://github.com/michaelgpearce/coinmux.