As you may have noticed I am switching to Fluxbox and I am trying not to use Gnome programs to keep my configuration light, one problem I have faced is how to read PDF files without using evince, or adobe application, which are big, a good replacement I have found is xpdf

To install it on Debian or Ubuntu just run:

sudo aptitude install xpdf

it does not render as the complex and big PDF files as good as the Adobe application but it works for the most of work you may need.