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http://msdn.microsoft.com/vbasic/
A surprising number of people automate VB applications with Tcl.
TclBridge greatly eases work with VB.
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
A nice Cheat Sheet for moving from VB6 to Tcl here: http://sourceforge.net/docman/display_doc.php?docid=11951&group_id=10894