This script is for the easy installation of deb files. Just select the deb file, or files, and select the script in your Scripts folder. Personally, I think for several debs in a row it's easier than using the Gdebi GUI installer.
(I added a 'Deb-Tweaker' on GNOME-Look as well if you want to use it's two scripts before this one. http://gnome-look.org/content/show.php?content=129857)
- Just extract and add the script to your nautilus-scripts folder '~/.gnome2/nautilus-scripts'