Thanks for this link. I love smalltalk and had an opportunity to use a commercial implementation (Cincom Smalltalk) whilst working in biodiversity information. I found the development environment to be really productive - esp. during my self learning period. Having everything to hand in one environment/image which I could live in all day and do editing, debugging, REPL and data was compelling. Saving the whole system state in the image for the next days work was great too.