Devon H. O’Dell announces the release of snazvx, it is based on 9vx (Russ Cox’s creation for emulating the Plan9 operating system in user space), and it allows the creation of Plan9 instances on demand using simply a browser. In short, you will be able to create and test your own Plan9 without needing Plan9 and just by using the services of snazvx.
To use it you only have to visit the snazvx website: http://testbed.dh0.us/ and after registering, you will be able to create plan9 instances on demand which you can control with a Java applet that loads on the same page, or with your favourite VNC viewer.
The service is still in its testing period, but even so, the instances work perfectly, as a sample, a screenshot: