[[...]]

http://msdn.microsoft.com/vbasic/   

A surprising number of people automate VB applications with Tcl.

[TclBridge] greatly eases work with VB.

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[kennykb] writes on comp.lang.tcl:

Perhaps the best head-to-head comparison of Tcl and VB in the context
of adding GUI to a legacy engineering application was written by no less
a light than [Brian Kernighan] (co-inventor of C, among his multitude
accomplishments).  You can find it at:
http://www.usenix.org/publications/library/proceedings/tcl95/kernighan.html

And [Marty Backe] replies:

The postscript version [[of the article above] is > 11 MB. 
I've created a pdf version of it (~200KB) that can be gotten from here:
http://www.lucidway.org/Marty/Tcl/Docs/kernighan.pdf

[HJG] 2005-08-30 This page asks for username & password

[AMG] 2005-09-02 Mirror!  http://ioioio.net/tcl/kernighan.pdf .  Thanks Marty for emailing me your copy; I will host it for you and everybody.

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A nice Cheat Sheet for moving from VB6 to Tcl here:
http://sourceforge.net/docman/display_doc.php?docid=11951&group_id=10894
[RS]: Hm, interesting.. but even on A4-Landscape, I can't print it decently...

[LES]: if that is still useful to anyone (two years later!), here [http://tinyurl.com/4vy59] 
is a remodeled page, and here [http://tinyurl.com/6ol9m] is this remodeled page in [PDF].

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[WJP] Also, butt-ugly. There's a very nice comparison of Tcl with VB in Brian Kernighan's paper ''Experience with Tcl/Tk for Scientific and Engineering Visualization'' [http://www.usenix.org/publications/library/proceedings/tcl95/kernighan.html] That's about as definitive as you can get. (In case you were wondering, Tcl wins.)

[EKB] I read Kernighan's paper with interest. It's really nice (although woefully out of date by now).  It gives a balanced appraisal of several languages. But I don't think it's correct to say that "Tcl wins" out of the VB/Tcl comparison. Kernighan's own summary:

 As a rough summary, for the specific  purposes  I  have
 used  it  for,  Visual  Basic  is  significantly better than
 Tcl/Tk for the purely visual part (creating the interface on
 the  screen  and  having  it look somewhat like a commercial
 product), worse for programming, and  extremely  unsatisfac-
 tory  for  interprocess  communication.  Each is the easiest
 interface-building tool in its native environment.

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[Category Language]