As a buddy, they even did not face any penalties, just a friendly nod:
http://searchengineland.com/070503-121944.php
http://www.cartoonbarry.com/2007/05/i_busted_google_volkswagen_plu.html
http://digg.com/design/Volkswagon_busted_for_using_hidden_text_to_spam_Google

Every new day brings a new not-so-nice story about Google. They are loosing their focus over there.