The tutorial written by Stephen Pope and Glenn Krasner: www.ccmrc.ucsb.edu/~stp/PostScript/mvc.pdf contains three examples that were originally written for Smalltalk-80. Here are change sets for these examples that are adapted to Squeak:
The counter example: CounterExample.cs
The organizer example:
OrganizerExample.zip
This archive contains two files: A changes set, and a file named 'Org1.txt'.
This file can be read by the organizer.
The financial history example: FinancialHistory.cs