For 10.6.2, the following procedure should upgrade you easily.
Originally Posted by silverblack
Just to confirm, this works perfectly with prior methods on the 1005/1008, provided you use the old kernel version. The new kernel will not boot. No other changes are necessary, all your kexts will work fine and everything that worked (sleep, sound, mic, wifi with new card, bluetooth, video, etc. all works no problem).
The way I'd recommend doing this update is in terminal typing something along the lines of:
Then, edit the "com.apple.Boot.plist" in your Extra folder, replacing:
sudo cp /mach_kernel /mach_kernel.bak
Now, you can just update via Software Update and are good to go.