[Yum] once you have yum, what else matters?

[Robert P. J. Day]

  no, i'm not being facetious.  in all seriousness, i'm writing a section for
an admin manual on advanced package management (that is, beyond
just rpm to install/upgrade/remove), and was wondering what was really
necessary beyond advanced rpm operations and yum.

  there's always the apt/synaptic stuff but, realistically, i don't want to try
to cover every possible way to do this.  and since it's aimed at admins,
a graphical front-end is not critical.

  so, once someone has a handle on rpm and yum, is there really any
compelling need to know about even more package management
systems, short of just curiosity?

rday

p.s.  i'm restricting this discussion to RPM-based systems, of course.
debian packaging is a totally different issue.  i *might* make passing 
reference to ipkg, but only briefly, in reference to embedded systems.