It's actually been ten years since the 10th anniversary episode, "Forever Red" came out. To celebrate, the writer of the episode decided to do a blog detailing the process. It's a really good read since PR is one of those shows where very little of the creation/adaptation process is ever made public outside of actor interviews at cons.
http://amitbhaumik.tumblr.com/post/2...en-years-later
Did You Know: The title of the episode was inspired by Wu-Tang Clan's album Forever? As it also featured ten greats in one place.