What Irons Do You Play?

I was just interesting in what type of irons people were playing. I have recently gotten very, very comfortable with my new Titleist AP2 irons, hitting them better and better and actually dialing in the yardages a tad better than when I was flying every green at the U.S. Open qualifier.

Before that, I had some Titleist blades that I nearly hit the grooves off of, and I feel irons are the one part of the golf bag that people stick with for years if they're working.

What do you play? Any favorites? Do you switch a lot or stick to your favorites?