From the publisher's website:
Exalted Domains are a new option that grants clerics a truly special and unique connection to one aspect of their deity’s power in exchange for one of their domains. Rather than draw bonus powers and spells from two domains, the cleric with an Exalted domain has a greater focus on a single domain, and can utilize powers not available to any other character. Exalted domains can be used to create clerics with a special place of honor within the church, a renegade who may even be seen as a heretic by the organized worship of his deity, or a unique foe that has a surprise in store for the PCs.
The Genius Guide to Exalted Domains of Light and Lore focuses on the domains most often associated with gods of knowledge, good, aid, and assisting a group. If you want to create a specially blessed healer, a sage of divine lore, a stalwart guardian of the temple, or a craftsman tasked with creating the relics of the gods, these Exalted domains provide a quick, easy, balanced method for doing so.