WotC has only addressed this (AFAIK) for Arcane spellcasters in the Forgotten Realms. Circle Magic is described in the Forgotten Realms Campaign Setting; one specific flavor is described under the Red Wizard Prestige Class entry in the 3.5 DMG.
That being said, expanding Circle Magic to address Divine would be a fairly easy adaptation of the model.
Additionally, Relics & Rituals has a Ritual system that allows for tandem, power-boosted casting. This system is meant to work for both Divine and Arcane casters.
A lighter version of the R&R system appears in the Green Ronin product The Witch's Handbook.
Those are the options I know of.