scififan68, if you use GMA950 Sleep don't work in 64-bit ( actually it can sleep but no weak up ), Sleep only work in 32-bit mode as GMA950 driver is buggy and only 64-bit drivers are available in 10.6.2 only (removed in 10.6.3,4,5)

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10.6.2 Pcj 64-bit kernel | Mobo Asus P5LD2-VM Revision 1.03 945G/ICH7 Graphic Intel GMA950 | CPU Pentium 4 630 3 GHz HT
Sleep never wake up, Quicktime 64-bit crashed

10.6.2 Vanilla | Mobo GigaByte GA-EP43T-UD3L | CPU C2D E7500 | GPU GigaByte GV-N240D3-1GI Nvidia GT240 ( Full QE/CI )