I became hooked on Smalltalk after working on a VisualWorks project (GPLUS) at Ford Motor Co. for several years.
A Squeak project I work on in my spare time is a stacking Smalltalk class browser called the Whisker Browser. Some screenshots, changesets, and further description of the ideas are at http://www.mindspring.com/~dway/smalltalk/whisker.html. Anyone who's interested in this subject feel free to email me.