Actually, I was the one with the TeX WYSIWYG editor (called WysiTeX). The
project was once part of a bigger one in our company, and we intended to make
it a separate product, but there was no workable marketing concept. You can
have a look at some screenshots and an explanation of the concept at
http://www.heeg.de/~hmm/
Late last year my boss gave me the permission to open-source it. It's not
working in Squeak yet (it was a VisualWorks 2.5 app), and I have somewhat
limited time, so don't expect it to be finished anytime soon. If you look at
my "what if you had..." page on the Squeak Swiki
(http://minnow.cc.gatech.edu/squeak/940) you'll see that it is one of the
projects that I'd like to do when I get some time for such stuff from my
company (which will be sometime this year). However, it did not get the most
votes until now. The project which most people votet for is Collage, a source
code management system for Smalltalk. Read all about it on the Swiki.

Hans-Martin