So you need a way to organize content for your students? When you go to the lab, or even in your classroom, do you want to direct your students to content, without resorting to announcing or writing down link addresses? Then you definitely want to look at edu.symbaloo.com.
Using Symbaloo, you set up a grid of links. Each block is a different link. For instance, the one to the side focuses on a variety of Discovery Education resources. Really easy to get started, and I think this will help all classrooms and teachers, especially since you can find many already created. A great free resource!