I started writing this post within minutes of 10.6.8 being released to the public (before actually installing it). I was going to start by explaining how 10.6.8 was a simple update, as had been the case with all previous Snow Leopard updates. Unfortunately, had I continued with that post, I would have mislead everyone.
Once I completed a backup- always necessary before any update or system change- I removed SleepEnabler.kext, installed the update, and rebooted. Though this process worked countless times before, this was not the case with 10.6.8; it wouldn’t boot past Chameleon. After hours of testing and a ton of help from Nathan in the comments, I was able to boot 10.6.8.
Had everything gone according to plan, you’d be reading an update guide right now. Unfortunately, 10.6.8 was- and still is- proving to be quite troublesome. 10.6.8 is running very slowly and my WLAN card (for Wi-Fi) is no longer recognized. If you recall, I upgraded my WLAN card to the Broadcom 94321 for native OS X kext support. Both this card and my original Dell 1395 aren’t recognized in 10.6.8, even with the correct IO80211Family.kext installed.
Given these reasons, I currently do not recommend updating to 10.6.8. Nevertheless, should you choose to update anyway, you can follow either Nathan’s guide in the comments.