Currently, manually installing software using deb files often requires downloading and installing multiple packages, which should be avoided. It would be ideal to use develop a special format using a tar.gz file (or similar) for the archive that contains the deb packages as well as a file that tells the installation program what order to install the packages, as well as other useful information.
Brad wants to install the free NX server from http://www.nomachine.com. He downloads the main server package, and discovers he needs another package. He downloads that and discovers he needs another one. He wishes there was an easier way to install it.
Sharon is a new Linux user and wants to install Democracy Player from http://www.getdemocracy.com. She is confused and wonders why she needs to download and install two packages to get one program. She thinks it would make more sense to have a single download.
David wants to install Inkscape from http://www.inkscape.org, but doesn't have internet. He is rather annoyed from going to a computer that has internet to download a package each time he finds out he is missing a dependency.
Data preservation and migration