So here’s a short demo video of a Solitaire game running in a Smalltalk environment (via David Buck). It clearly illustrates features such as full introspection (e.g. by using the object browser) and live “fix-and-continue” debugging:
I think these videos are useful for demonstrating the power of Smalltalk’s environment. On a side note, I discovered Objective-C supports some form of “fix-and-continue” debugging as well.