At Smalltalk Solutions 2007, I was able to give a one hour presentation about the progress, use of, and lessons learned creatiing the Smalltalk (VisualWorks) binding to Cairographics 2D Vector Graphics Library. It went well enough, there are things I'd like ot impove, but I was happy enough with it for the first time.

I not only used Cairo's ability to render the slides during the presentation, but took advantage of the polymorphic backend nature of Cairo to render all of the slides via PDF. They can be downloaded here. Warning, the rich graphic nature makes them a hefy download (58 MB).

Also I have published the code which modeled the slides and did all of the rendering (either to screen or pdf) to the Open Repository. It is named TAG-StS2007. It's not really a good example of my best coding. Not really at all actually. But it got the job done and is probably mine-able for examples. You'll need to add the method "half" to ArithmeticValue.