I updated (sudo yum -y update) from 126.96.36.199-137.fc8 to a 188.8.131.52-12.fc8 kernel. Apparently this kernel is highly buggy.
I saw “pnpacpi: exceeded the max number of mem resources: 12” on the boot. I was having screen flashes (highly unstable!) and couldn’t get my Intel wireless NIC to work.
I was apparently not the only person to find this to be the case. The Bugzilla reference shows us just that.