An important skill for a Product Manager is the ability to parachute into an existing product and land on your feet. In this talk the Director of Product for Animoto, Paul Yokota, discusses how to immerse yourself in your new company and how to do as much as you can as quickly as you can.
He also talks about how you can understand your products problem domain, how to collect good qualitative data, how to set expectations with an new team and how to become the product diplomat.