For the purposes of this post, let's consider Project Manager and Producer roles the same thing. There is certainly no clear distinction in our industry - more on this in a future post.
Trolling around the Droga5 website, in the "Stuff" section. I found, "I Want to Marry a Producer" by Ted Royer, Droga5's Executive Creative Director. It's one of the funniest, most endearing (and somewhat creepy) things I've read recently. He discusses various intra-agency marital options: account person, client, even another creative but dismisses them all for a producer. I don't know Ted personally (not entirely sure I'd like to - I certainly wouldn't want to get too close) but he has a body of work that puts him in high-regard in the industry and, in my book, his romantic side adds to his rep.
I always appreciate it when PM's and Producers are recognized for the important roles they play. Unfortunately, recognition of PM contributions isn't the norm. If you haven't read my post Project Management Success - Where's the Evidence?!, which features a clip of Dustin Hoffman, playing Stanley Motts, the self-absorbed producer in Wag the Dog, give it a try. Hoffman delivers a hilarious set of tirades about producers and recognition.