Ira Glass has another vision. The first one launched his hugely successful show, This American Life, which developed a fresh narrative style for public radio. Now Glass has a plan for an entirely new generation of storytellers who can bring public radio into the new millennium. But that takes talent, something that many say has been in short supply for public radio the past few years. At the Public Radio Conference last month in Orlando, the buzz about the talent crunch dominated discussions among managers, producers, editors and engineers alike.