I got an interesting piece of news from a customer today - see this article on Bank of America and Image Cash Letters? The very first exchange of Image Cash Letters between that bank and a customer used a Cincom Smalltalk based system from DeepCove Labs. Here's what they say about Smalltalk:

DeepCoveLabs, is in the business of developing payment processing solutions. We currently offer products for cheque conversion, multi currency credit card processing, international electronic funds transfers into about 30 countries, cheque printing in many currencies and languages, a currency exchange module and a CRM system for managing a payment processing operation.... all written in Smalltalk by a couple of developers at a time. Why Smalltalk, this is not an item of debate for us, everyone involved feels they personally can more done faster using Smalltalk than with any other tool set.