I just started watching Mad Men on DVD. I really like this program. It has great stories, complex characters and a great look. The opening credits are simple, stylish and hint at something dark or self-destructive to come. And, they've spawned a couple of great parodies. There's The Simpsons (only one I could embed shows it right next to the original):
And The Muppets (only the first 15 seconds is worth seeing if you are an adult. If you are a small child, the rest is entertaining)