I have just released a new version of the _Formatting Information_
chapter on Compatibility and Conversion at
http://latex.silmaril.ie/formattinginformation/compatibility.html
which covers conversion from wordprocessors, other document formats into
LaTeX, LaTeX into other document formats, and some general tips on
conversion.
This is a late draft — I believe it is all there, but I would be
grateful if you could let me know of any inaccuracies or omissions.
Peter