In case you weren't able to attend the meeting or want to review parts of the presentation, you can take a look at an HTML version of the PowerPoint presentation entitled The Iterator Design Pattern. The presentation included several code samples which can be downloaded from the following links:
We ended the talk with a challenge to rewrite the FizzBuzz game using iterators. A complete description of the problem is available at the TCS Developer's SIG Twiki site. A sample solution in Smalltalk is now available. Don't peak until you've tried it yourself.