Overall, I like the look of the new Turning/Rebuking rules (although the point raised in the Turn Undead thread about Rebuking your entire party is one I hadn't previously considered).
One thing that popped into my mind while reading it that I thought might make an interesting idea would be Counter Turning. Effectively, this would be identical to the Counterspelling action (under whatever rules- current or new mechanics- that come with Pathfinder), but would allow a good-aligned cleric to counter a rebuke with a turn or vice versa.