Nawcom has made a 10.2.0 kernel for AMD/P4 users!
He made a nice installer for this. So you can just run the installer on 10.6.2 and youre good to go.
It also includes a patches SleepEnabler.kext.

Download Here

Source: Tea Blog, Prasys Blog

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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