http://www.hotmath.org Hotmath provides guided solutions for the actual homework problems in popular math textbooks. It’s like having a free on-line tutor for Algebra through Calculus with select textbooks.

http://www.nytimes.com/learning/teachers/lessons/archive.html

The archive contains hundreds of free lesson plans for grades 6-12. You may perform a keyword search to retrieve a lesson, browse the archive by subject, or scroll down the page to view the most recently published lessons.

http://practicalmoneyskills.com This site is great for teaching economics, kindergarten through grade 12 and even beyond! There are lesson plans for various age/grade levels, and you can even order some materials to be sent to you, such as a CD ROM and a curriculum kit with worksheets and all. This could serve as a useful tool in meeting some of those additional life skills requirements for high schoolers.

http://www.kn.pacbell.com/wired/bluewebn/index.html

Blue Web'n is an online library of 1700+ outstanding Internet sites categorized by subject, grade level, and format (lessons, activities, projects, resources, references, & tools). You can search by grade level (Refined Search), broad subject area (Content Areas), or specific sub-categories (Subject Area). Each week 5 new sites are added.