We've found a new site http://scienceofeverydaylife.discoveryeducation.com/ that has plenty of projects to learn (& earn) from!
One of my favourites is designing a wind turbine for renewable energy, just like the ones we are surrounded by in & around Ramsey...
check this out & see how many houses you can power... (design within this section) http://scienceofeverydaylife.discoveryeducation.com/innovation/