If you are interested in computer generated graphics you may know POVRay (Persistence of Vision Raytracer). It's a a free tool to create high-quality computer generated images and animations using raytracing. This tool has its roots in DKBTrace - a program written by David Buck.
You may know David from the "Simberon Design Minute" on the "Industry Misinterpretation" Podcast series. His original DKBTrace (and even the modern POV-Ray) benefited from some object oriented ideas taken from Smalltalk.
David (who is very active in the Smalltalk community) now announced that he rewrote the Internet Ray Tracing Competition website using Seaside and VisualWorks Smalltalk.