I got one of my first trips into the exhibit hall today. One of the booths that stood out was the TeachersFirst.com booth. They are a completely free site where teachers, students, and parents can access using their subject/grade level search, keyword search, or extensive menus.
Their site states : TeachersFirst is a rich collection of lessons, units, and web resources designed to save teachers time by delivering just what they need in a practical, user-friendly, and ad-free format. They offer our own professional and classroom-ready content along with thousands of reviewed web resources, including practical ideas for classroom use and safe classroom use of Web 2.0.
Check it out today: http://www.teachersfirst.com/index.cfm