A new campaign from Expedia.com highlights tools that Expedia has developed to help consumers make their travel plans. It carries the tagline "Go with confidence," developed by new agency Doner, of Southfield, Mich. In one spot, travelers carry Expedia's trademark yellow suitcase in exotic locales as a host talks about what makes a confident traveler. "They know what days will save them the most money with Expedia's airfare and hotel rate calendars," he says, as a drop-down menu on screen shows how the calendars work. Other descriptions include virtual tours and consumer opinions of certain destinations. As …