Where in the world are people working with Knowledge Systems or Expert Systems
For a much more complete overview see Using and Understanding AI on the WWW by Carol E. Brown, Les Gasser, Daniel E. O'Leary, and Alan Sangster. Here you'll find some sites I encountered.
To what purpose are these systems developed
Here you'll find a handful of expert systems ordened by domain, some of them with a descriptive page on the web where you can find out more about them.
