The Pennsylvania Department of Education
https://www.education.pa.gov/Pages/default.aspx
The Library of Congress
http://www.loc.gov
Over 10 million digitized primary sources, including documents, images, motion pictures, sound recordings and maps. Experience these resources, along with related lesson plans, features and activities that will help enhance teaching and learning in your classroom.
The Educator's Reference Desk
http://www.eduref.org
Resource Collection - Links to over 3000 resources on a variety of educational issues.
Lesson Plans - The collection contains more than 2000 unique lesson plans which were written and submitted by teachers from all over the United States.
Question Archive - A collection of over 200 responses to popular questions on the practice, theory, and research of education.
ERIC Database - The world's largest source of education information contains more than one million abstracts of documents and journal articles on education research and practice.
Thinkfinity
http://www.marcopolo-education.org
Internet Content for the Classroom - Marco Polo provides the highest quality Internet content and professional development to K-12 teachers and students throughout the
United States. First launched in 1997 as a collection of standards-based, discipline-specific educational web sites for K-12 teachers.
Skill Builders K-8 Interactive Sites
Math, Reading, and Language Arts interactive activities
Links for K-12 Teachers
http://www.internet4classrooms.com/k12links.htm
Several large collections of subject area and resource links for K-12 teachers.
CyberBee (PreK-5)
http://www.cyberbee.com/index.html
Learn practical ways to use Internet resources in the library, classroom, or at home through these electronic excursions. You will visit several destinations that will include travel tips, curriculum ideas, cool sites, and cutting-edge technology.
Microsoft in Education
http://www.microsoft.com/Education/Schools.aspx
Learn how to use and integrate Microsoft software in the classroom with in-depth step-by-step tutorial guides for students, teachers, and staff.