3 links
LyX - The Document Processor
lyx.org
An open source document processor running on many Unix platforms (including MacOS X), OS/2, and under Windows/Cygwin. LyX produces output using LaTeX in the background.
LyX on Aqua
iki.lyx.org
HOWTO for installing and configuring LyX on the MacOSX native Aqua graphics display.