acroread

If you want to conserve paper or don't want to carry around a lot of paper, it is possible to print multiple pages on a single sheet of paper.

There are two utilities for setting multiple pages on one piece of paper. They are called mpage and psnup

mp...

To create a pdf from a PostScript document (ps), use ps2pdf

To create a pdf from a TeX, use pdftex or pdflatex