Introductory web sites about materials science and engineering

I an giving a talk to a group of high school students about materials
science and engineering.
It will be useful to have a list of interesting web sites for them to
visit. The following list shows what I have so far. Can anyone suggest
more sites that would be interesting at an intorductory level?
Discovering Materials Science,

Career Resource Center for Materials Science and Engineering,

IOM3 Materials Careers (UK),
The A to Z of Materials,
Matter,
Key to Metals (See articles)
Key to Steel (See articles)
Virtual Materials Science Center,

---------------------------------
Pittsburgh Pete