literature
Cyberguides: free web-based literature units for k-12
Offered by the Schools of California Online Resources for Education, these are free lesson plans based on high-quality literature, and grouped by grade-level. Each unit includes several activities to extend the learning. Unfortunately, the program has been unfunded for several years, and some of the links in the units are bad, but there are still lots of great ideas here. A few examples (follow the link for more):
k-3 grade:
Creativity Resources from the Denver Art Museum
Lesson plans for Early Childhood, Elementary and Secondary levels. Each focuses on a particular piece of art, and includes a full page photo of the art piece in question, allowing you to do the lesson at home. There is also a database of the museum's art work, searchable by country/culture of origin, medium, period and continent of origin.
Lewis Caroll Homepage
The Lewis Carroll home page, hosted by the Lewis Carroll Society of North America. Lots of information about the author, lesson plans for Lewis Carroll's books and projects completed by students.