Slate has a good update on how The Dark Knight will continue without Heath Ledger, who plays the Joker. There have been plenty of rumors lately that Ledger had not finished his work on the film, but Warner is insisting that they have everything they needed. Another reassuring note, Slate claims if they did need to hire a voice artist to fake a couple of voice loops for the Joker, the professional result would be completely unnoticeable.