Best of the blogs: That headline doubles as the advice with which John West titles this Leading from the trenches post. “Every leader has to decide what the core values are in their leadership philosophy, and act to protect those when they are threatened,” he writes. West offers eight corrective actions to take, when need be, beginning with, “Don’t finesse.” From the Test Center: Virtual Iron and XenSource are currently targeting the low-to-middle end of the virtualization spectrum with Virtual Iron Enterprise Edition 3.7.1 and XenSource Enterprise 3.2. That means chasing a leader. “VMware’s head start over the rest of the market is substantial,” explains Paul Venezia. But don’t count the smaller guys out. After playing with both platforms for a few weeks, Venezia writes, “I’m left with the feeling that VMware better not sit on its laurels. These two products are on their way to providing truly enterprise-grade virtualization foundations for a mere fraction of VMware’s licensing fees.” Read the full review. Related: Editor’s Letter: Is VMware feeling the heat?The news beat: Google scoops up Postini for its messaging security products, and claims it will help attract bigger customers to Google Apps. Samsung and Ericsson agree to cross-license mobile patents, thereby ending recent lawsuits between the two companies. And Dell says it will sell Linux on PCs outside the U.S. Careers