I wouldn't mind seeing epoch and arch (in addition to vendor)
appear
in the default output, too. Many problems are hidden when people
don't realize that epoch and arch exist and may be different.
$ yum list installed x*
xsane-gimp.i386 0.92-13 installed
xscreensaver.i386 1:4.18-4 installed
name.arch epoch(if not 0):ver-release whereitis
you can do the same with rpm:
rpm -qa --qf "%{name}.%{arch} %{epoch}:%{version}-%{release}\n"
-sv