Those poor, stretched-thin kids at the Observer are going to have to stretch themselves a little thinner. "Edgy Enthusiast" columnist Ron Rosenbaum is ditching the pink paper to share his random meanderings on Shakespeare and Bob Dylan with Slate's more patient, equally geriatric, audience. Rosenbaum, a journalistic legend in this town since 1877, when he wrote an article about how you could make free calls on Alexander Graham Bell's new voice-carrying device, leaves a large acre of space for the Observer folks to fill. Presumably, we can expect more real estate coverage. Or ads, if they can sell them.