Product Launch Management Compared to Project Management

http://www.oplaunch.com/project_versus_product.htm

What is the significant difference between the responsibilities of a product manager and a project manager? Typically, a product manager is concerned with product life cycle management issues, which include sales performance data. Typically a product manager is more concerned with market and business issues than a project manager. A product manager is a primary contributor to a product's pricing strategy.
A product manager may request things that strain the schedule because of a belief that the adjustments will improve future sales. A project manager is likely to favor a strategy that maintains the schedule.
A successful product launch requires contributions from both product management and project management disciplines. Preparation for a product launch is a high stakes activity. Your company's success is often proportional to the success of your next product launch.