City of Materials is a site from the American Society of Materials that contains resources, CSI type cases, podcasts, hands on activities, an introduction to the basics of materials science, podcasts and lots of resources for educators.
The site is very nicely designed and the activities are great and it explains the topics very well.
There is also information on careers in materials science and engineering.
Materials science and engineering is a very important area that affects everyone, everyday. This site is a great resource for teachers to use to get students interested in these areas and STEM in general.