Tcl is supported as a server-side programming language for Precisium's web hosting plans.
(running as cgi under an account-specific username)
We use Tcl/Tk extensively in our own systems and have considerable experience debugging and resolving Tcl issues.
Because we are enthusiastic about Tcl/Tk as a development platform, we continually upgrade our Tcl interpreters to very recent versions.
The Tcl maintainers have an excellent history of preserving compatibility with earlier scripts across Tcl updates. We don't run versions older than 8.5, but if you need assistance in getting older scripts updated to use Tcl 8.5+ features - we can most likely help.
Do you have some tedious business processes which you'd like automated?
A Tcl/TK program can be created as a self-contained 'copy to install' program which can assist you in tasks ranging from organising files and sending emails, to running complex import/export processes. It could be a hidden background program running on a schedule, or provide a graphical interface for launch and control.
As a 'scripting' language, the source code remains accessible to you so that you have the freedom to get your own developers/IT staff to make further customisations.
The Tclers Wiki - This is the core of the Tcl developer community. An excellent resource for sharing your experience and learning about Tcl.
There is an official Tcl Tutorial which covers Tcl 8.5
The comp.lang.tcl usenet newsgroup is a fast easy way to ask fellow Tcl programmers for help. Google's newsgroup interface to comp.lang.tcl is probably the simplest way to access this.