One option is to use dvips to convert your regular
dvi files to PostScript. As the normal DVI fonts are
resolution-dependent, and the output imagesetter is very high resoltion, Please
use at least 600dpi fonts, or preferably 1200dpi. PDF produced (via
Distiller or ghostview) from dvips output will not have many
useful features, in particular if standard TeX fonts are used it may render
without antialiasing (so plus signs may turn into minus signs when displayed
with Acrobat Reader, etc.). It will also not be searchable, and it will not have
a table of contents. It may also be very large. In short, this approach produces
a large ugly file, and is not recommended.
The next two options are better, as the fonts will be resolution independent
and antialiased upon display.