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