A few hours ago, Henon announced the new version of foxGUIb, for
creating user-interfaces.
He also mentioned a surprise, and I know you have been holding your
breath 
I’ve written a user-guide for it, aimed at the beginner.
Why don’t you check out foxGUIb together with its guide?
The link to the software is:
http://fox-tool.rubyforge.org/
and the above link also points you to the guide. The direct link to the
guide is:
http://www.mikeparr.info/rubyguib/foxguibhome.htm
Enjoy!
Best wishes
Mike Parr
(Thanks to Henon for being great to work with!)