Unfortunately, I'd made a near-fatal mistake when I installed the update with Pacifist. I unselected one too many things, causing OS X to gawk and hang up instead of boot (curse you, BootCache!). Not wanting to dig up the lone, delicate install CD (which is mandatory for restoring a Carbon Copy Cloner image on a failed Hack lol) I went with another idea and whipped out the old drive I just replaced and reinstalled the update to the new drive, followed by all the needed kexts. Rebooted into the new drive, and presto! Works fine. Saved half an hour that way.
The moral of the story - with this update, it's better to uncheck too few kexts than too many, so be careful and if you're not sure leave the sucker checked. Happy updating!

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Custom Hackintosh...AMD Athlon X2 5000+ (2.6 GHz) on GA-MA78GM-S2H...Linksys WMP300n Wireless...ALC889a sound...ATI HD 3650 PCIe...1 GB DDR2 RAM...320GB Western Digital SATA + 200GB Seagate IDE HDD...Rosewill DVD-RW IDE...Running Kalyway upgraded to 10.5.7...All Fully Functional