Engadget just updated again. Correcting that the Apple site did not say PCIe 2.0 from the beginning http://www.engadget.com/2008/01/18/geforce-8800-gt-upgrade-causes-headaches-for-some-mac-pro-users/
Yeah, I emailed them last night and asked them to make the correction. It is nice to see that they actually went back and fixed it.