NASA provides a number of design challenges, lesson plans and information for primary school students and teachers. At the moment there is a competition available to the students to design a chamber that will allow a plant to grow in outer space.
This website provides some ideas on how teachers can integrate technology into their curriculum and also how to integrate the KLA's and has a section on problem based learning.
This website provides a couple of design challenges. While there are few challenges they can be altered to meet the needs of learners in different grades or learning ability. Pity it's a NSW site.
This webpage is based around the tv show 'Design Squad'.\nThere are a number of activities available for students and teachers aimed at grade 4 and above. There is also an educators guide available that has a number of activities that work well with the curriculum.
This is one of the YouTube clips I used in my unit plan. It offers an alternative to, or supplements having the children grow their own seed which is a common activity in primary school.