Is there any clear and concise guide to enabling the AGP Bridge? I have been fooling around with it for the longest, but I still can't get it to work. Thanks!

If you have an intel board this will work:

sudo bash
enter your password
cp attached file (compiled from Darwin 8.01 CD) to /System/Library/Extensions
chown -R root:wheel /System/Library/Extensions/AppleI386PCI.kext
reboot

I learned this installing the alpha Nvidia driver, which does work.

should this be the only setting in that kext?

<array>
<string>pci8086,2571</string>
</array>

i added this to the existing entires and it showed up as agp.

it worked right off the bat with the above...thanks again!

Depends on your motherboard.
8086 means its an Intel motherboard (Vendor ID)
The second # is the device ID. Other posts tell you how to snoop this in Windows or Linux.
I didn't have to change this to make this kext work for me. I did have to in the nvidia.kext.