If you want to "test drive" LaTex without downloading it, there is now a web application for you:
When I taught statistics I learned to use LaTex, a very helpful program for typesetting equations. While we used Stata for the in-class assignments, I used Latex constantly to create handouts, exam review sheets and homework PDFs. For Mac, the distribution is MacTex.
Many scholars I know also use LaTex as a bibliography management tool, though I prefer Bookends even if it's not free.