FYI for anyone else who has an ATI 4870HD you will need a modified EVOenabler.kext so SL properly reports that card as 4870, not 4890. I discovered that there was a larger problem than WoW at hand. OpenCL tests crashed all the time, which got me thinking the problem is with the kext. After a little more digging deep in (other) message boards I found the solution. For convenience, I uploaded and labeled the kext to Kexts.com so anyone else who runs into this problem will have an easy solution.

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My Hackintosh

OS X 10.5.8/10.6.2
Intel i7 860
GA-P55-UD3R
2x2 Corsair Dominator 1600MHz DDR3
Zalman CNPS9700 LED Cooler
ATI Saphire 4870HD 512MB