In addition to what Vicerious said, the Catalogs of Enlightenment major ability lets you cast three spells from a cleric domain as if you'd prepared them. Presumably you could add those spells to your spellbook, as you can any spells you've prepared. You also need a Wisdom high enough to actually cast them, as with Arcane Disciple, but instead of one feat per domain this is one feat for all domains, assuming you have the time to redo the recharge requirements (it's paperwork, and it takes weeks for each time).
Even without this craziness, that feat is amazing. Just the minor ability of adding the special function of any domain is awesome (Kobold domain for trapfinding, Baator for seeing in any darkness, etc), and that's just one planar touchstone! Once you've got the feat, you can attune any touchstone you want just by visiting it and completing the "test".