Today, the home page of Google App Engine doesn’t show its well known logo:
Instead, a red cross showing that either the logo is not present on the server or that the URL pointing to this logo is wrong.
The home page has been deployed even if the User Interface tests should have failed with what we can consider a minor bug.
Test the URL, I would be happy to know if you have the same issue: http://code.google.com/appengine/