I've read too much!
But so far, I passed the power plant, drove on the wrong side of the road for 5 miles on the freeway, and cut off my fingertip. Even though it was just a game, I couldn't bring myself to kill a man (which goes a LOOOONG way to tell how awesome Heavy Rain is. I didn't have the balls to shoot a virtual guy. In GTA, I'd have shot Niko's grandmother if I had a chance). I'll come back to this thread after I beat the game.