Same issue here, identically. I've tried all the kernels from the Zeph rev1 disk and I'm currently using the 9.2.2 kernel with the same issues.

Don't think it's safari related as it happens to me when left overnight with nothing but the finder. Agreed hyper, "really annoying"!! Especially as everything else is perfect.

AMD athlon 64x2 6000+
2Gb DDR MSI K9AGM2 (atisb600)
Msi Geforce NX8600GT 512mb

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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.