For anyone who might be interested in some extra information about setting up under Windows, here it is:
You need Ruby obviously, from:
http://www.ruby-lang.org/en/
After starting RubyGo, you may get a message like 'tk83.dll not found'. The instructions at http://rubygo.rubyforge.org/troubleshooting.html
are a bit outdated, as the latest version of Ruby does not include Tk.
So you can't just copy the file, you have to install Tk (and Tcl) from:
http://www.activestate.com/Products/ActiveTcl/
Once you have this installed, if you get any complaints about missing tk dll's, you can copy them from
(tcl/tk installation folder)\bin
to
(ruby installation folder)\bin
or add the first location to your 'path" under Environment variables in System properties.
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