Meredith Vieira signed off from 'TODAY' for the last time Wednesday morning after five years on the job. The co-host of the NBC program decided in April to leave the show, passing the baton to colleague Anne Curry. "It's tough. It's a hard one. Very mixed emotions. I'm looking at everybody right here and wishing I ... no, I know it's right, but it's hard," Vieira said at the top of her last show.