From the list of stuff thread:
http://brilliantgameologists.com/boards/index.php?topic=2546.0Turn/rebuke Undead
grants turn/rebuke undead - anything that grants turning generally stacks
Cleric 1
Paladin 4
Blackguard 3, ecl, command or rebuke only
Sacred Exorcist 1, ecl 8, Complete Divine, turn only
Ur-priest 2, ecl 7, Complete Divine, rebuke only
Divine Mind 4, Complete Divine, class variant (here)
Dread Necromancer 1, base class, Heroes of Horror, rebuke only
Death Delver 1, ecl 6, Heroes of Horror, rebuke only
Chameleon 3, ecl 8, Races of Destiny, see text
Master of Radiance 1, ecl 6, Libris Mortin, turn only - unclear whether you gain turning or if it only stacks
Tenebrous, vestige, ecl 7, Tome of Magic, unlimited use but see text
Knight of the Raven 3, ecl 7, Expedition to Castle Ravenloft
Apostle of Peace 1, ecl 8, Book of Exalted Deeds
Soldier of Light 1, ecl 6, Deities and Demigods
Deadgrim 1, ecl 6, Magic of Eberron - unclear whethero you gain turning or if it only stacks
levels stack for turn/rebuke undead (ie: requires turn/rebuke to qualify for the PrC)
Radiant Servant of Pelor, ecl 7, Complete Divine
Warpriest, ecl 6, Complete Divine
Eldritch Disciple, ecl 6, Complete Mage
Paragnostic Apostle, ecl 3?, Complete Champion
Ordained Champion, ecl 4, Complete Champion
Master of Shrouds, ecl 4, Libris Mortis - rebuke only
Sacred Purifier, Libris Mortis - turn only
True Necromancer, Libris Mortis - rebuke only
Purifier of the Hallowed Doctrine, ecl 6, Heroes of Horror - turn only
Death Delver, ecl 6, Heroes of Horror, rebuke only
Bone Knight, ecl 5, Eberron Five Nations, rebuke only
Deadgrim, ecl 6, Magic of Eberron
Eye of Horus-Re 1, ecl 7, Player's Guide to Faerun