Taken from The Pragmatic Marketer Volume 7 issue 5 2009.
My take away from this survey is that Product Manager does more project related work and detailed specifications. Product Marketing is more focused on customers, sales presentations and marketing programs. Still there is a lot of overlap between the two.
Here is another interesting article about the difference between Product Manager and Project Manager. In some companies, Project Managers are known as Program Manager. I also know of one company that merge the two functions into the Product Manager role.
Product management vs. Project management : How To Be A Good Product Manager: Product management tips.
Here is a write up of what a Product Line Manager does.
There is no discussion of what a product line is. A product line is really a product category. It can be classified by markets or by product types. Another way to look at it is a group of products within the same product mix that are related by function or customers. Examples of a product line in a semiconductor company would be Power management product line or networking product line.
Semiconductor Product Line Manager supervises Product Managers, Marketing Managers, Product Applications Engineers