There was a version of the below Dark Knight trailer circulating the internet earlier, but the quality was horrible. This isn't perfect, but it's a distinct improvement. The trailer was shown on Comcast On Demand in the US. We don't know what Comcast is, nor why you'd demand it, but evidently it's worth insisting on it for stuff like this. Most of the footage in the trailer isn't new; it's more of a greatest hits package of previous trailers. But, oh, what hits they've been, and this assemblage is the best and darkest we've seen. Just that brief flash of CCTV footage of the Joker gave our jeebies a distinct case of the heebies.
UPDATE: The 'Gotham Tonight' clip is no longer online.