An awesome StL area reporter keeps a blog about culture and geekery, aptly titled, Culture Geek, and she found something pretty cool.
http://bellevillenewsdemocrat.typepad.com/culturegeek/ If you go to The Dark Knight's website, they have taken down all of the movie stuff and replaced it with a simple memorial to Heath Ledger.
http://thedarkknight.warnerbros.com/ (you need to click through the picture of a bat)
I agree with the Culture Geek on this one, it shows real class on their parts.