Multiple slides per page

Often we want to save paper by printing multiple slides of a presentation per page....atleast I want to do it most of the times, saving paper :D. Best way to do this in linux is to use 'psnup' that works with ps files.

Sample usage:
pdf2ps infile.pdf outfile.ps
psnup -l -d -pletter -4up outfile.ps > final.ps

This will make it 4 slides per page, options other than '-4up have to with
'info psnup' shows the huge number of options that psnup takes.