it seems that KP just before/after sleep is a common problem with SL in 64bit-mode. Maybe this problem is releated with SleepEnabler.kext. We should try to sleep with AppleIntelCPUPM.kext and see what happens.

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iHack NB: P35 | SB: ICH9R | CPU: C2D E6850 3.0Ghz | RAM: 4GB DDR2 800Mhz | MB: GA-P35-DS4(rev1.1, bios F14) | GPU: MSI GeForce NX8800GT 1GB | NIC: Realtek R1000 | AUDIO: ALC889a | OS: Retail 10.5.8 & SL 10A432 | BL: Chameleon 2.0RC1(PCEFI v10) + DSDT.aml

(sorry my poor English, I'm Italian)