Heres my two pence worth of garbage: 1. If each package had a md5sum file, one could verify the space requirements before installing a package.
2. md5sum files in the package could be signed. (secure) 3. After configuration new md5sums can be generated and signed (for security) With signed md5sums and a bootdisk with md5sum, keyring and pgp on it one can check the system for unallowed alterations. Theres your security. What I would like most on md5sum files is that one can tell if a package would fit before/during installing and that should be something dpkg or apt should learn. May the Source be with you. Goswin