Install package: http://dl.nawcom.com/legacy_kernel-10.7.0.pkg.zip

Download SleepEnabler: http://dl.nawcom.com/SleepEnabler.kext.10.6.7.zip

Some specific info for AMD people: Since a new version of the patched libs got installed, you need to repatch them with amd_insn_patcher. You can either do it command line, or just re-install the 10.6.6 legacy kernel via its install pkg, as that also runs amd_insn_patcher against /usr/lib/libSystem.B.dylib and some of the QuickTime libraries.

More Info: http://blog.nawcom.com/?p=640

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Mac Inspiron 531 » 10.6.8 • 10.8.0 Legacy Kernel • AMD Athlon 64 X2 5000+ (2.60GHz)
Dell M2N61-AX/nForce 430/MCP61 • 4GB Dual Channel DDR2 667MHz
ALC888 • nVidia GeForce 8600 GT 256 MB
2 x WDC WD5000AAKS 500 GB SATA HDD