I'm installing updates from http://download.fedora.redhat.com/pub/fedora/linux/updates/testing/13/i386 (is that the wrong place to go?) Right now it contains gnome-icon-theme-2.30.1-2.fc13.noarch.rpm and gnome-icon-theme-extras-2.30.1-1.fc13.noarch.rpm and these two don't like each other, leads to a version clash.