Here are some of my favorites!

Resources

What Is Engineering? NASA | NASA For Kids: Intro to Engineering Video

How Stuff Works: www.sciencekids.co.nz/videos/engineering.html

Popular Mechanics: groobylabinabox.com

Design Squad Global: pbskids.org/designsquad

Global Cardboard Challenge: imagination.is/our-projects/cardboard-challenge

Ideas/Inspiration

Instructables

HowToons

PBS Design Squad

ZoomSci

Crafty Cow

Learn Sparkfun

Tinkerlab

The Tinkering Studio

Wonderopolis

Destination Imagination