I'm a big fan of David Fincher, the guy who directed Seven (or Se7en, but I refuse to call it like that), Fight Club, and Zodiac. He also did Panic Room, which I thought wasn't too shabby. I found out today he's also directed various commericals. He did one recently for Nike, which you guys may or may not have seen:
http://www.youtube.com/watch?v=jlXRengzZoc I have writer's block, I feel like I should be writing more, but it ain't happening.