title: iAd error "Ad inventory unavailable" (Apple Sample code also not working)
body: <p>I tried to include an ADBannerView into my application. But the ADBannerView always ends up in bannerView:didFailToReceiveAdWithError:. I'm not able to see any test ad.</p>
  
  <p>I've also downloaded the iAd Sample Code from Apples DevCenter but I end up with the same error.</p>
  
  <p>11/5/10 5:46:33 PM BasicAdBanner[12072] {
      ADInternalErrorCode = 3;
      NSLocalizedFailureReason = "Ad inventory unavailable";
  }</p>
  
  <p>Can someone please explain to me how I can get iAd to work in the Simulator and on my testing device?</p>