Just to be clear, is this the guide you've added? http://guides.macrumors.com/iOS_5_Primer Just wanted to be sure as we research this...
It's been almost 3 months now since I edited the iOS 5 forum head... and the guide STILL refuses to show up. Since that forum is the newest addition I know of, perhaps someone capable of administering forums needs to go into the vBulletin extensions manager and enable Mac Guides integration for it?