my way is to copy is name mach_kernel.voodoo to mach_kernel then make a copy of it called backup still just on root of drive then when i reboot i just type backup -v -f after an update. Then i can recopy backup back as mach_kernel incase apple replaced it. Always good practice to keep that renamed kernel "backup" where it is. Alot of time after an update it wont reboot first time may need a couple of reboots each time with -v -f as i think it finishing installing updates. If you have voodoo rc1 you should be fine just using apples update but having said i am running no patched files.

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