High quality PDF output from LaTeX and TeX. TeX supposedly defaults to bitmap (Type 3) fonts instead of scalable (Type 1 or TrueType) fonts, which are sized for printing, but not so well for screen viewing. I've seen plenty of grainy PostScripts on the web which obviously demonstrate this problem. They all print great, but it's scary to start a print of 300 page documents that look like that on the screen.