Some discussions over the last several months, including just yesterday:
* The Birth of Tcl: https://news.ycombinator.com/item?id=31111220
* TclTutor 3: https://news.ycombinator.com/item?id=30327945
* Tcl/Tk Spline Editor: https://news.ycombinator.com/item?id=29772621
* Tcl library for CSP: https://news.ycombinator.com/item?id=29421786
* Why Tcl syntax is so weird: https://news.ycombinator.com/item?id=29143346
* Tcl: Lisp for the masses: https://news.ycombinator.com/item?id=28957701