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This guide worked great for me, but I was getting kernel panic's about AppleSMCPDRC on my E6510 i5 every time I tried to update to 10.6.4. I finally have everything working (on the vanilla 10.6.4 kernel no less) by using Pacifist to install everything in the 10.6.4 Combo Update package except the AppleIntelHD* KEXTs. So if you're having update problems, try that.