The movie business is cut-throat so at sad times like the recent death of Heath Ledger, credit is due to Warner Brothers who have made their Batman: The Dark Knight website a simple tribute to Heath (who plays the Joker). This at a time when the studio would normally be promoting the movie at every opportunity.
Screenshots taken directly from http://thedarkknight.warnerbros.com/.
Well done Warner Bros and it is nice to see commercial marketing take a back seat.