Professional Sites for Teachers

Teacher's Net
This is an excellent site with many resources.  You can subscribe to a mailring based on almost any interest related to teaching.  It also provides teachers the ability to chat with popular individuals in the field of education.  
Rating: 5/5
Teachervision.com
A member of The Learning Network, Teachervision.com, offers many great resources for teachers from lesson plans to classroom management techniques.
Rating: 5/5

Lesson Plans/Thematic Units

LessonPlanet.com
Teacher's Net
Listed above, this site also has many great lesson plans.
Kinder Art
A truly wonderful resource for art activities.  It has many different topics and is not just for K anymore.  This one just keeps getting better...check it out.
AskERIC Virtual Library Lessons
The AskERIC Lesson Plan Collection contains more than 1,000 unique lesson plans which have been written and submitted to AskERIC by teachers from all over the United States.
The Lesson Plans Page
This site has many original lesson plans. Searchable, or you can browse by subject area.

Children's Literature

Carol Hurst's Children's Literature Site
This site has book reviews and activities for many of your favorite children's books.
Rating: 5/5

 Free Printouts

Teachervision.com
A member of The Learning Network, Teachervision.com, offers many great resources for teachers from lesson plans to classroom management techniques.  Have maybe the most varied collection of free printouts.
Rating: 5/5
FreeWorksheets.com
Find 2500 free worksheets to print or download. Subjects include: Math, Phonics, Science, Social Studies, Handwriting, Humane Education, History, Language Arts, and more.
Rating: 5/5
Edhelper.com
Find thousands of worksheets along with lesson plans and other teacher resources.
Rating: 5/5

Top Teacher Sites Lists

Sites for Teachers Ranks several hundred sites for educators based on votes.  Note: Clicking on the preceding link takes you to the site and registers a vote for The Teacher's Guide.  If you wish to go to the site without voting for The Teacher's Guide...click here.
The Best of the Web for Teachers
Ranks several hundred sites for educators based on votes.  Note: Clicking on the preceding link takes you to the site and registers a vote for The Teacher's Guide.  If you wish to go to the site without voting for The Teacher's Guide...click here.

School Related Clip Art

Awesome Clip Art for Kids
This site contains school related clip art for newsletters, web pages, e-mail, etc..  It also has a great feature where you can make your own puzzles to print out.  They even offer customized puzzle generators for several holidays and themes.
Rating: 5/5