Ken Norton, VP Products at Jotspot, posted this good wrap-up on product management last week (you can tell I'm not exactly keeping up with my RSS subscriptions these days). His focus was on how to hire PMs, but it's a good read to define what's a product manager in the first place. If you like to think about, say, how you'd handle traffic at a busy crossroads with incoming cars, busses and trucks going in all directions, you might want to consider such positions.