This unassuming little site has some of the best lesson and unit plans I’ve seen for engineering. Teach Engineering‘s curricular units have lesson plans, activities and links to online resources that add up to great interactive and hands-on learning. Just take a look at the Asteroid Impact lesson or Moon Colony (can you tell I’m doing a unit on Astronomy?). These activities are mostly off-line which is a great way to reinforce online learning. If you are part of a co-op, these are great projects for an engineering unit.