After 28 years, Regis Philbin this morning signed off as co-host of Live!. After New York mayor Michael Bloomberg presented the veteran talk show host with a key to the city, Disney honcho Bob Iger came out to salute Philbin, whose show is produced and distributed by Disney-ABC. Philbin’s response when Iger was introduced — “Oh, he’s still here?” Iger unveiled a plaque with Philbin’s name, which will be installed on the facade of the studio building where Live! is taped. Said Philbin to Iger during a commercial break, “I’m doing everything I can for you! After this you’re on your own!” Also in the audience for Philbin’s final show, which featured an emotional goodbye by his co-host Kelly Ripa, were Disney-ABC’s Anne Sweeney, Katie Couric, Meredith Vieira, Bryant Gumbel, Donald Trump, Tony Danza, Frank & Kathie Lee Gifford, John McEnroe and Diane Sawyer.