Package deltaiso

Create deltas between isos containing rpms

http://gitorious.org/deltarpm/deltarpm

This package contains tools for creating and using deltasisos,
a difference between an old and a new iso containing rpms.

System Administration (Section 8)
applydeltaiso
applydeltaiso applies a deltaiso to oldiso to re-create newiso. When specifying oldiso, you can specify a device (such as /dev/dvd).
fragiso
fragiso can be used to convert an iso file into a fragment file, which is a list describing all of the rpms on the iso and a data chunk containing everything...
makedeltaiso
makedeltaiso creates a deltaiso from two isos. Do not specify a device (such as /dev/dvd) for either oldiso or newiso.