Curiosity in the Classroom is a new site from Discovery Education that I really like.
There are lesson plans and resources for teachers, organized by grade level (6-8, 9-12), along with videos and webinars. There are some great resources here to help teachers get their students engaged in science and inquiry. The site was designed to "bring teachers, students and families on a journey through life's biggest questions."
There are also parent and student activities, including quizzes, links to the Curiosity TV show, and much more.
This is a great resource to help teachers spark curiosity in their students.
Top 10 Resources from Discovery Education - all free