A New York Times article says that Google will be investigated for its $3.1 billion dollar acquisition of DoubleClick to see if the company has violated any antitrust laws.
Last month, Google acquired DoubleClick for $3.1 billion and was challenged by rivals, particularly Microsoft. However, a month later, Microsoft acquired aQuantive for a value of $6 billion.
According to the New York Times article, "Google said it was confident that the deal would withstand scrutiny." I think given recent events and in response to the latest acquisition by Microsoft, this will indeed be the case.
Forum discussion at WebmasterWorld.