Bajanboy
My sys is suffering from random reboots on Zeph's 10.5.2 R1 but no solutions have worked for me.
There is a thread titled "Mouse movement bug" dealing with random reboots. Some solutions work for different systems. Some not.
Was thinking of trying Kalyway next but if the same prob is still there....

Can you describe how your reboots are happening, when left alone? Blue screen? spinning dial? grey screen?

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My Hackintosh:
Kalyway 10.5.2 Intel/Amd -- Speedstep, Netkas Smbios, AMD test patch 2.
Mobo: MSI K9AGM2
Chipset: AMD 690v ATISB600 -- SB600ATA kexts
CPU: 3Ghz AMD Athlon 64x2 6000+
Ram: 2gb Rambo DDRii 667
Graphics: Nvidea MSI nx8600GT 512MB -- NvInject 512 (fully supported 100% working)
Audio~External: Focusrite Saffire -- (100% working - ootb)
Ethernet: 8101E -- Realtek R1000 (100% working)
HDD: 320GB WD SataII (150gb Boot Partition)
150gb Lacie Firewire/USB RIP my dear Lacie.