Apple released the 10.6.4 update today. Go ahead and update your hackintosh, it went fine for me. Be sure to remove SleepEnabler.kext before installing because you’ll get a kernel panic, and it’ll be a pain to fix. I couldn’t get into single user mode to delete it, I had to use MacDrive to delete the kext. If you deleted the kext file before restarting, it should be fine. Be patient though, the first boot took forever for me.
[UPDATE] You can get SleepEnabler.kext for 10.6.4 here.