A new article from Richard Eng on who uses Smalltalk.
There are many people and projects all over the world who use Smalltalk. And yes it is true that mostly new projects start in more "fashioned" languages like Java. So this is more a question about how well known Smalltalk is and about popularity. There is also this common misbelief that new technologies must be better out of the box. I have some doubts in that - because today many software technologies or languages are very specific, written in a hurry or lack a solid and stable engineering foundation.
My answer to the question on who uses Smalltalk would be much easier: anyone who is interested in clean OO solutions and knowledgable enough to value increased productivity and long term maintainability.