Nothing beats the good old latex for writing a technical paper.
Recently while working on my synopsis, I was thinking where to find latex when I visit places without my system? The answer is found on some of the pages I visited. There are a couple of good sites with updated tex installation which would help in compilation of the files on go.
For documents: http://dev.baywifi.com/latex/Default.aspx
For equations only: http://www.codecogs.com/components/equationeditor/equationeditor.php
Keep up the good work!