Hi Loren and Co:
It is a GUI interface for yard where you can run yard in a window rather than on the command line.
To try it, just type:
gem install my_yard
Then cd to the root directory of your ruby project, and enter:
That site was generated by my_yard by selecting the "visualruby" template and the "visualruby" theme.
Give it a try: select "visualruby" rather than "default" and your docs will look like the website above.
Let me know how it goes.