We use this website regularly with our seventh and eighth graders. We always have them start here when they begin research, and we use the clipart in many of our presentations. Information can be broken down by level so the students can find the information they need on whatever level they can understand it!
I frequently visit this website for different lesson plan ideas. Rarely do I use them as they are- I usually tweek a bit for my students, but nonetheless, this is a fabulous website to help you get a jump start!