Download my free introductory physics text, with over 2000 pages in 5+1 volumes, written with LaTeX, from www.motionmountain.net. It is surprising, entertaining and captivating on every page.
Volume 6 is not textbook material, but a research text; it presents a speculation for a unified model that contains general relativity and quantum field theory. Its main prediction: the standard model of particle physics and general relativity are all there is in nature. www.motionmountain.net/research.html
Thoughts on the future of LaTeX are found on www.motionmountain.net/onlatex.html