MetalcastingDesign.com offers the following free webinars to use as resources for casting design.

Metalcasting Processes Webinar
Engineered Casting Solutions publisher/editor Al Spada takes attendees through an overview of the numerous metalcasting processes that can be used to produce the physical and mechanical properties you need in your metal component.  

Casting Design Webinar
Given by Jiten Shah of Product Development Analysis, a manufacturing engineering company, this webinar highlights the basics of casting design, from types of alloys and processes to basic steps taken during the design process to ensure you are getting the most--for less--out of your cast part.