Herald publisher: "We're here to stay."

Miami Herald publisher David Landsberg has cut a slick TV spot - in both English and Spanish - that will launch this month.The commercial is a video version of his "Message to Readers and Advertisers" posted on the paper's website March 22. The spot appears to be part of the Herald's ongoing campaign to assure not only readers, but advertisers, that the Herald is here to stay.In the video, a