How to view DVI on Mac OS X?
Install XQuartz from http://xquartz.macosforge.org and you'll be able to run Xdvi:
xdvi filename.dvi &
from the terminal will do. A full MacTeX (TeX Live) installation is of course required.
...and without XQuartz one can use dvipdfmx filename.dvi
to convert dvi to pdf.
I've been using Skim with good results: http://skim-app.sourceforge.net/