I don't think there is a feat for turning opposing clerics (but there might be), but I think there are feat for turning outsiders in Defenders of the Faith. I know there are in the pic Levels hand book.
It seems like a good idea, but it reminds me of when I played Baldurs gate (a CRPG) and had an evil cleric in the party and at epic levels sh could turn really powerful good creature, like paladins, and amke them explode. That was cool.
I like the idea, too, of Divine Interdiction: on a successful turning check, you cut off the cleric from his deity and he thus (temporarily) loses his spells and ability to turn/rebuke undead.