There is a tutorial but we should finish it using Spec https://pharo.fogbugz.com/default.asp?W67 We are planning to write a complete one but benjamin should come back from holiday.
Note that the difference is not between Smalltalk and X, Y Z the difference is between graphical frameworks: for example in VisualWorks you write application GUI differently than in VisualAge or Pharo. Stef