Mailing list
There is a Starkit mailing list for discussions related to Tclkit and Starkits. This list also has a newsreader interface at Gmane.
For Metakit-specific issues, there is a separate Metakit mailing list - it also deals with the C++ and Python bindings. This list has a news reader interface at Gmane as well.
The "Failure Feedback Forum" on this website can be used to report bugs.
Related projects
TclDevKit - by ActiveState, is a development tool for Tcl/Tk which has adopted Tclkit and Starkits as its deployment strategy.
Practical Programming in Tcl and Tk - by Brent Welch (4th edition) adds a chapter about Metakit, Tclkit, and Starkits.
ProjectForum is a commercial collaboration-type application which uses Tclkit as its runtime and which is deployed as a Starpack on Windows, Macintosh, and Unix.
Psychometric Research & Development Ltd are a UK based firm which build and deploy their products massively based on Tclkit and Starkit technology. Examples are CareerDemon and this Financial Times article of work done at British Telecom.