Kathy Schrock Guide - Discovery - http://school.discovery.com/schrockguide/ - Very popular among classroom teachers. Offers a list of sites useful for enhancing curriculum and professional growth.
Blue
Web'n - http://www.kn.pacbell.com/wired/bluewebn/- Online
library of 1800+ outstanding Internet sites
categorized by subject, grade level, and format (lessons, activities,
projects, resources, references, & tools).
Internet Public Library - The University of Michigan -http://www.ipl.org/div/kidspace/ - Resources for all ages - kids, teens, and adults, categorized by subjects.
Teaching
with the Internet -
http://www.schoollink.org/twin-
Acollection of resources for teachers and students ranging from "Internet
Basics" to Internet resources and web-enriched activities.