Mentioned on WWWEDU today. "Blue Web'n is an online library of 1952 outstanding Internet sites categorized by subject, grade level, and format (tools, references, lessons, hotlists, resources, tutorials, activities, projects). You can search by grade level (Refined Search), broad subject area (Content Areas), or specific sub-categories (Subject Area)." Sites like this should have RSS feeds so their listings can be aggregated.
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