This page lists about a dozen links to key places on the web regarding Tcl/Tk. It's quick and dirty... sort of RAD, just like Tcl/Tk :o)
There's a weekly post on comp.lang.tcl, called Tcl-URL! (with an archive [L1 ]), which summarize news and points to a couple of central Tcl/Tk sites:
The "Welcome to comp.lang.tcl" message by Andreas Kupries
http://www.purl.org/NET/akupries/c.l.t.welcome.html
The contents of the page above is mailed to everyone posting
to the Tcl USENET newsgroup news:comp.lang.tcl for the first time.
Larry Virden maintains a comp.lang.tcl FAQ launcher
http://www.purl.org/NET/Tcl-FAQ/
Some day, a general site for Tcl news, pointers to tutorials, etc.
http://www.tcl.tk/
An organized Tcl resource center can be found at
http://purl.org/tcl/home/software/
They also keep info to convince your boss Tcl is a good thing
http://purl.org/tcl/home/scripting/
ProcPlace has a comp.lang.tcl contributed sources archive
ftp://ftp.procplace.com/pub/tcl/
Cameron Laird tracks many Tcl/Tk references of interest
http://www.phaseit.net/claird/comp.lang.tcl/
Cetus Links maintains a Tcl/Tk page with verified links
http://www.cetus-links.org/oo_tcl_tk.html
The comp.lang.tcl.announce post archives are at
http://groups.yahoo.com/group/tcl_announce/
A Usenet announcements newsgroup for Tcl is
news:comp.lang.tcl.announce .