Just like everybody else, we’re watching “The Dark Knight” again and again, but there’s an another Batman related project out there. Batman Gotham Knight. It contains six different stories with six different anime-style drawings. Every story is about to 12 minutes long, but still it’s a very-VERY different Batman experience.
Buy from Amazon.com: DVD - Blu-Ray

Before “The Dark Knight” and “Gotham Knight”, you should be sure about watching “Batman Begins” first. It’s much more like Tim Burton’s Batman, not James Cameron’s I-am-wearing-a-superhero-costume-with-nipples-on-it Batman.
Buy from Amazon.com: DVD - Blu-Ray