"Max Muermann" <ruby / muermann.org> wrote in message 
news:b445fba40609072038i2d0613bfoaf5679ba35c3bea2 / mail.gmail.com...

> the moment there are AFAIK no good free graphical debuggers available.

If you have Visual Studio 2005, you can download the free version of Ruby In 
Steel which has a full suite of graphical debugging tools - breakpoints, 
trace into/over, drag-and-drop watch variables, locals, autos, call stack, 
integrated debug-and-eval console etc.  :-)

best wishes
Huw Collingbourne

http://www.sapphiresteel.com
Ruby Programming In Visual Studio 2005