If you have any interest in American Open Wheel Racing this is a good read. Its an interview with Robert Clarke, departing head of HPD. I knew he was instrumental in trying to get the two series back together but I never realized how much time he had put into it.

Link

"Racing is such that it'll take everything you have and it's never enough," Clarke added. "That's just the nature of competition. The good thing is you're constantly forced to show up at the race because the race is going to happen, whether you're ready or not. If you expect to win you have to have your absolute best equipment and your latest technology. Everything has to be your best from race to race to race. It never stops."