Earth Day Activities: A great list of resources including: Litter Detective LP, Ocean Food Chain Web Diagrams, 4th Grade Enviornmental Unit, Seuss Lorax Save the Trees Game, Earth Day Fun, Recycle City (interactive activiteis and games, looks way cool!), Free Coloring & Activity Book
Earth Day Fun Themes: Lessons, Mini Units and Crafts - from AtoZ TeacherStuff.com
Earth Day Sites: A Strong list of 16 Earth Day Sites, some duplication form above, well organized with annotation -from Oswego Schools, NY.
Great Sites for Teaching About Earth Day: 9 excellent Sites with emphasis on student involvement and civic responsiability - from EducationWorld.com.
PlanetPals.com Can not begin to describe all the teacher resources and activites here, it is a commercial site with a kids club and online store, proceed with caution, but seems ver, very worthwhile!