TexPoint - A Latex add-in for Powerpoint that enables the easy use of Latex symbols and formulas in Powerpoint presentations. - http://texpoint.necula.org/
GrindEQ - Converting Word to TeX, TeX to Word, and MathType to Microsoft Equation. - http://www.grindeq.com/
TeX Converter - A freeware windows front-end to a number of programs that convert TeX files to HTML and other formats. Download, information and samples. - http://www.mayer.dial.pipex.com/tex.htm
TeX4PPT - Enables PowerPoint to typeset sentences and equations using LaTeX. - http://www.ecs.soton.ac.uk/~srg/softwaretools/presentation/TeX4PPT/
TeXPort - From TeX/LaTeX to Microsoft Word. Purchase Windows software or conversion service. - http://www.ktalk.com/texport.html
TeXaide - A special version of Design Science's Equation Editor that generates TeX. Available for Windows 95, 98, 2000, Me, XP, NT 4.0 and newer: free download on registration. - http://www.dessci.com/en/products/texaide/
Chikrii Softlab - Microsoft Word to LaTeX conversion: Word2TeX and TeX2Word. Download shareware versions. - http://www.word2tex.com/