Ars: As part of its efforts to avoid being swallowed by Microsoft, Yahoo negotiated an advertising deal with Redmond's worst nightmare: Google. A test run of the program apparently worked well enough that the companies have agreed to run the program for four years, with options for extending it to as many as 10, even as Microsoft's interest in Yahoo waned. But regulators in both the US and Europe have started raising questions about the antitrust implications of the deal, raising the possibility that it will never go into effect. This skepticism has caused Google to start aggressively making its case for the deal, both in public and on its corporate blogs. Apparently, the company was worried that the different venues might make all the information diffuse and difficult to obtain through a web search, so it has now put it all in a single place.