OK was looking at the Elemental Focus feats and the magical School focus feats and their wording would seem to indicate that their effects would stack on appropriate spells.
For example if I had Greater Spell Focus: Evocation and Greater Elemental Focus: Fire the saves on my Fireball spells would be 4 more difficult to resist.
Is there a rule or stacking issue I am missing? It would be very feat intensive but a +4 to appropriate spells might be nice.
I would say they stack since they are unspecified bonuses.