With time running out on an ultimatum issued by Microsoft last weekend, Yahoo is still searching for a way to counter the attack or at least to get Microsoft to up its offer. Now, news is leaking out about the potential of News Corp. partnering with Microsoft in some sort of deal in its bid to acquire Yahoo. News corp.'s Fox Interactive is the owner of MySpace. That could potentially make the triad a much more formidable competitor to Google. Meanwhile, back at the ranch, Yahoo has announced it plans to test Google search ads and is in talks with Time Warner, parent company of