Smalltalk for Ruby Programmers

HN commenters point Rubyists and the Smalltalk-curious to it as an approachable introduction that shows the Smalltalk system browser and Pharo environment in action.

Noel Rappin's MountainWest RubyConf talk introduces Smalltalk to Ruby programmers. He compares the two languages' object models, blocks, 1-based arrays, simple syntax and live programming environment, and walks through sample code.