Education World
Excellent resource for web pages you can use in the classroom. The top ten is a must!
Teacher Link
lesson plans... including complete units
ASK ERIC
hey if they don't have it, they will let you add yours
Cyber Guides
the stull buster (in my humble opinion) its awesome!
The Learning Web
earth science explored-for a quick overview click on "index of lessons and activities"
The Lesson Plan Page
ok may be not the easiest to navigate through, but its huge