Tcl Yahoo

 What: Tcl Yahoo
 Where: http://freshmeat.net/projects/tclyahoo/ 
 Description: Tcl/Tk Yahoo chat client.
        Currently at version 1.0 .
 Updated: 08/2002
 Contact: See web site

This package doesn't appear to be found any longer...

http://adtmag.com/article.aspx?id=23497 was (at least in Oct 2008) an article about Yahoo providing better access for developers. Hopefully the result will be some bindings for Tcl to various yahoo functionality.