It's been 5-months, and a lot has been released and discussed. Here are the highlights. We're about a month away:

Two-Face official clip: http://whysoserious.com/myhero/

Trailer 4: http://www.firstshowing.net/2008/06/15/alternate-comcast-on-demand-trailer-for-the-dark-knight/

Trailer 3: http://www.whysoserious.com/happytrails/trailer.htm

Early Two-face concept art (not final product and the real deal is said to be even more extreme): http://www.aintitcool.com/images2007/DentBurn.jpg

There are also 4-5 TV spots floating around out there, but there's nothing in them that can't be found in the various trailers. There has also been a large number of high resolution images leaked within the past month or so. Check the Superhero Hype forum for those.