Rubistar offers several excellent assessment tools that help clarify expecations and benchmarks

Writing and Grading Rubrics

A collection of language arts grading tools.

Designed by educators for teachers, parents, and students interested in creating project-specific evaluations. (Does have an annoying mouse trail)

Schrock's comprehensive guide to formative and summative assessments offers links to even more useful tools and rubrics.

This encyclopedia entry describes rubrics and provides a link to alternative assessments.

This article explains the value of creating objective assessment tools students can use as a guideline for project evaluation.

Education World

A site of lesson plans, professional development, technology integration, and school issues.

Teachers Hub

A list of the top learning sites on the web