Summer is going to be hot for Google and Yahoo, after the American DoJ has begun issuing "civil subpoenas" to gather additional information about their announced co-operation.
Co-operating with a competitor, especially if you are a dominant company, may certainly get you in trouble if you do not have a good story.
I wonder whether the two companies are in talks with the European Commission too. Not showing due awareness and respect for the European impact (and for the European authorities) may end up generating a second Microsoft-like monster.
Will Autumn bring answers?