Mentor Graphics offers an On-Demand Webinar: Heat Sink 101 as taught by Alexandra Francois-Saint-Cyr.  Alexandra is the Applications Engineering Manager for North America at Mentor Graphics, Mechanical Analysis Division (Previously Flomerics). For the past 8 years, she has been working on promoting the use of the Mentor Computational Fluid Dynamics (CFD) software by conducting training classes, seminars and software demonstrations.
Here is an abstract of their on-demand webinar:
During this 45 minute presentation, we will focus on how heat sinks work and how to design a heat sink while considering all the critical factors such as size, airflow, cost and attachment methods. We will also investigate how, using simulation, the heat sink design could be optimized and validated in the application environment. Engineers involved in board and chassis design would find this session very educational.
You can view the webinar at Mentor Graphics Web Site at this link:Â Heat Sink 101 Webinar @ Mentor Graphics