In "Configure Your Computer", "Software Management", "Media Manager" there was no source for updates
I think this only happens if you chose the upgrade option at the end of the install procedure.
I think perl-base is a required package, meaning it shouldn't be uninstalled, or at least not easily. And I don't
understand if it installed along with perl-devel since it contains the /usr/bin/perl binary, and most (all) drak-tools require /usr/bin/perl.
If you know _exactly_ what you're doing you can run 'urpme perl-base' (with an optional --no-deps or --force)
but I'd advice against it.
As for updating, have you tried ftp'ing to those servers. Perhaps they're down or something.