This document is written in lyx http://www.lyx.org, a (almost) WYSIWYG latex software. Lyx is not an independent latex software like SWP in the sense that lyx converts its .lyx file to .tex and call latex to compile and make use of standard latex tools such as xdvi, dvips, pd2pdf, latex2html etc as its viewer and converter. Because of this, lyx has no compatibility problem with standard latex and you can always work with the exported latex file directly if necessary.
Lyx has many distinguished features. What I like most is its configurable key bindings. You can choose binding styles from SWP (scientific workplace key bindings), CUA (windows word like keys) and Emacs and add your own keybindings easily. Helpdesk dot file repository has a binding file that has all usual math symbols and you can make use it by copying it to ~/.lyx/bind and set Edit -> Preferences -> Look & Feel -> Interface -> Bind file properly.
The best way to learn lyx is through its online help system. All tutorials are written in lyx and you can try all the commands while reading.
Lyx 1.1.6fix4 is installed on /usr/local/bin and you can start it by typing lyx. Lyx will detect your system settings, configure itself and create a folder .lyx under your home directory at the first time.
Lyx has been ported to windows. However, because lyx is based on latex, X-system and various Unix tools, you have to have MikTex, cygwin and other companion software. Please refer to lyx for windows webpage http://www.fh-hannover.de/mbau/tim/hentschel/lyx/index.htm on how to install lyx on windows.