Nice to see an author actually supporting their work :)
I'm curious, why the decision of Ruby over Python? Executable pseudo-code seems like a very happy medium between the languages. There's even Jython to pull in a few extra people from the JavaIsTheOneLanguage audience ;-).
I'll gladly help to convert the examples from Ruby to Python and add in some extras if you'd consider Python for a second edition. Python needs more quality books.
I better stop before this post disappears as a Python troll ;-)