Hi,
I made two new screencasts showing a small domain-specific debugger for SUnit and one for PetitParser.
https://vimeo.com/83017763 - SUnit https://vimeo.com/83017762 - PetitParser
There is also an older one for announcements (https://vimeo.com/83020584).
The debuggers were created using the GTDebugger a.k.a. the "moldable debugger" framework http://scg.unibe.ch/research/moldabledebugger
Cheers, Andrei