From Autoweek, thought it was interesting:
Porsche plans to invest some $3.6 billion to buy a 20 percent stake in Volkswagen to prevent a hostile takeover of the fellow German automaker. VW supplies a variety of parts for Porsche, cooperates with Porsche on vehicle development, and is part of a group working on a hybrid powertrain with Porsche. The companies also shared engineering on the Porsche Cayenne/Volkswagen Touareg/Audi Q7 luxury sport/utilities.