FOSS is a research-based science curriculum from grades K-8 developed at the Lawerence Hall of Science, University of California at Berkeley. The FOSS program materials are designed to meet the challenge of providing meaningful science education for all students in diverse American classrooms and to prepare them for life in the 21st century.
This is a weekly online magazine that is available online. It has videos, slide shows, and read-aloud text that couls aid in helping students to learn how to read.
This website contains many WebQuests for all subjects at the elementary level. It also includes links to websites on how to create WebQuests. This site has links to WebQuest sites suggested by Innovative Teaching Newsletter.
This site has tons of worksheets: English, Handwriting, Holiday, Phonics, Reading, Science, Social Studies, and more. It includes flashcards, word lists, activities, and templates for lesson plans.
I think Weekly Reader is one of the best curriculum suppliment resources. I used it every year I was home schooling my daughter. One of the things I love about it is that it is always current. For example, one of our 2008 issues for children grades 4-6, discussed our process of voting for president and gave the children the opportunity to vote for president. It's not just for elementary levels either; it goes all the way to 12th grade.
This is an awesome website I found that has classroom activities, teaching modules, lesson activities, and resources for teacher education and curriculum development.