After spending a few million $ with Google Adwords, using Adsense on several sites with more than XX million impressions a month and after
promoting writing about Google Analytics for free, I received an email from Google Germany (!) to remove the Google logo.
Google Germany is at least so friendly and asks me to fax a permission request to the Google US plex. However the Google logo guidelines says:
"That means we have to turn down many requests because sites imply that Google is endorsing them or is otherwise affiliated with them"
I understand their concerns about their brand, but there are about 40,900,000 Google logos out there.