Damn, I hoped it was in someone's homebrew rules, that's why I posted it there.
I'll have to make something myself.
Let see, how about this:
The cleric makes a turn check that is 1d20+level+Cha bonus.
Undead have a turn DC that is equal to 10+HD+Turn Resistance+Wis bonus, with an extra +1 bonus for each square beneath the undead and the cleric. (So, an undead 5 feat away gets a mere +1, while one who is 60 feet away gets a +12.)
Undead that have their turn DC beat are pushed 5 feet away from the cleric, and takes a number of damage equal to the turning check.
When using Greater Turning (the Sun domain power), you get a +10 bonus on your turning check.
Does that seem balanced?