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Reading from the screen
Refrain from printing when reading from the screen is just sufficient!
Viewing PostScript files.
The only decent viewer is evince: http://live.gnome.org/Evince
Other document types: possible do enlarge the font in the corresponding applications, on the terminal, or even on the desktop (KDE or Gnome).
In your documents, prefer a landscape layout which is easier to read from on a screen without having to scroll down. Otherwise, people may prefer a print copy. See PDF editions of the free Tux Magazine
(http://www.tuxmagazine.com) for nice examples.