We review the evidence supporting valence-fluctuation-mediated superconductivity in CeCuSi and CeCuGe , where T reaches 2.4 K at high pressure. In these systems the valence and magnetic critical points, at p and p , respectively, are well separated. Characteristic signatures associated with both are distinct. In contrast, the valence and spin fluctuation regions appear much closer in most Ce-based compounds. Concerning d-transition metals, superconductivity in pure iron emerges in the pressure window 15-30 GPa with the onset of T up to almost 3 K. All relevant observations point to unconventional superconductivity, likely mediated by ferromagnetic spin fluctuations.