Please, consider TeXmacs: http://texmacs.org/ (TeXmacs is not based on LaTeX, but can export to LaTeX or HTML if it is necessary.) Make an informed choice between TeXmacs and LyX.
TeXMacs is a good piece of software, too, but seems to me to have a much steeper learning curve for those who are used to other word processors.
The Singularity Institute needs to hire 1-2 people who are fluent in LaTeX to help us transform past and future SI publications from looking like this to looking like this.
As with the remote researcher positions, pay is hourly and starts at $14/hr but that will rise if the product is good. You must be available to work at least 20 hrs/week to be considered.
Perks:
If you're interested, contact luke@intelligence.org and describe past LaTeX work you've done, with attached PDF examples.