Google and Yahoo being investigated by Justice Department for antitrust violations

The Justice Department has begun an antitrust investigation into Yahoo's test of Google's search advertising technology according to an anonymous source cited by Reuters:

The source, who spoke on condition of anonymity, said that some of the government's concern focused on a telephone call from Google Chief Executive Eric Schmidt to Yahoo Chief Executive Jerry Yang to offer help in thwarting Microsoft's $44.6 billion bid.
Microsoft has to be giggling like The Joker if Schmidt's attempt at swooping in like Batman leads to a date with Gotham City D.A. Harvey Dent.