Home Page - http://www.sics.se/~emmanuel/
In summary, scripting and Tcl have changed my programmer's life. There is before and after. I am a researcher and have been involved in numerous prototyping projects where we show people how to use the technology that we are focusing on (multi-user VR).
Before, we were coding horrible applications in C, it tooks months for a pale result. Then, I interfaced Tcl to our toolkit and now we can do in weeks what took us months before.
If you are interested, have a look at http://dive.sics.se/