Recently i was producing many funkload's bench results. Firefox lets you easily create files in PostScript format by printing page to file. I wanted easy way to convert produced ps files to pdf from Nautilus without going to terminal. Thanks to Nautilus, it supports custom scripts(more info here), that after putting to ~./gnome2/nautilus-scripts directory, appear in popup context menu.

  #!/bin/bash

  cd $NAUTILUS_SCRIPT_CURRENT_URI
  for arg in $@
  do
      ps2pdf $arg
  done

After saving that in ps2pdf.sh and making script executable you can convert one or multiple selected ps files to pdf by right clicking on selected file(s) -> Scripts -> ps2pdf
Very nice :)