If you haven't seen The Dark Knight yet, do yourself a favor and go. Brave the long lines and the crowded theaters. You want to see this before everyone does and tells you about it at the watercooler at work, and ruins the best part: Heath Ledger as the Joker. It's worth the lines, crowd and the wait for the late Heath Ledger's performance alone...not to mention there's the rest of the cast and the movie too. If Heath doesn't win an Oscar for his performance as The Joker, (even if he was alive) it will be an absolute travesty.
His portrayal of The Joker is by far the best, and by the term of "best" I mean he was the worst. I don't know if there has ever been a more evil, maniacal and menacing character that will stop at nothing to destroy everything ever in any film. At least there shure hasn't been one like this in quite some time. His take on the Joker, most notably played by Jack Nicholson in Tim Burton's Batman, is simply unbelievable. You have to see it to even begin to have some sort of a grasp on how good of a job Heath did. And after you see it, you will understand why he alledgedly went crazy at the end of his short life.
However, you will not understand how he took this character that we all laughed at (and with) when Nicholson portrayed Joker, and turned it inside out, twisted it even more, ripped out any sense of compassion and reason, and put it on the screen for us to enjoy. Heath put everything he had into this character for all of us. This was a once in a lifetime role that he put his soul into. And it didn't make it out.
Go see The Dark Knight. And thank Heath for making this movie what it is. And what any future Batman movie (possibly any movie with a villain, or maybe any movie that requires any acting...at all) cannot and simply will never be.