I'm the CTO for Kaloke Technologies. While we are pretty much a Java development company, I use TCL for a lot of tools that I build. I started using TCL about 1992. We had a class on TCL by Karl Lehenbauer and really saw how to unleash the power of TCL. That was also the starting point for us to build a pretty sophisticated monitor system. We used Scotty and Expect as the starting point.
My home site is http://www.schucker.org/Wiki.jsp?page=ToolControlLanguage