While waiting for Plus! for WLM, edited the message log stylesheet to be more like what a saved (to RTF) conversation looks like.
code:
Serynth says:
It uses the MSN conversation style and preserves multiple spaces and
new
lines
but is otherwise no different from the standard stylesheet (in terms of smilies, etc.). It's no MSN+ conversation log, sadly, but it's somewhat more copy-pastable. To use, place in the log directory [by default, usually C:\Documents and Settings\(Username)\My Documents\My Received Files\(email + some numbers)\History], preferably backing up/renaming the original MessageLog.xsl first so as not to lose it.
Hope this helps someone out.
http://www.geocities.com/serynth/MessageLog.xsl (apologies for geocities-ness)