I listened on the way to work today - so good.
Most interesting was him identifying his legendary six-inning no-hit from the bullpen performance in the 99 series against the Indians as the beginning of all his arm troubles. He was dealing with a lat issue, injured in game one, and by the end of his stint in relief he said he was in more pain than he'd ever been in before in his life, and that extended to his next start against Clemens and the Yankees (in which he went 7, giving up zero runs, 2 hits, and striking out 12).
Essentially, he said it taught him he could still excel at less than full strength, but it also was the trigger for all of the arm troubles that came afterward, since he had to alter his delivery to pitch with the lat issue.
I'd never heard it outlined that way - basically, it was all downhill from there, in Pedro's opinion. He didn't seem to regret it, necessarily, but he indicated that, from his new vantage point working with the front office, he might not have let him go out there and do it, if he knew how much value it would strip from him over the next four years.