If you miss Seinfeld (somehow, through the hundreds of reruns that are in syndication), then check out American Express's webisodes that have Jerry Seinfeld and Superman - voiced by Puddy himself, Patrick Warburton! The webisodes are five minutes each, with the first one starting in a diner - and the director is Barry Levinson.
Watch the websiodes here; there is also a "behind-the-scenes" look at the filming. Jerry Seinfeld also admitted that he was thinking of starting a boutique ad agency, within American Express's ad agency, Ogilvy; he says he's too busy now but the idea "still rattles around" his mind. Oooh...though he'd probably want to reference something more personal, Gothamist suggests he call the agency, Kramerica Advertising Worldwide.