Rubrics Resources

Authentic Assessment Toolbox (use links to the left)

Comments of Middle School Teachers who use Rubrics

Discovery Education: Kathy Schrock's Guide for Educators (dozens of rubrics in all content areas, rubric tutorials, and much more)

Explanation and Process
Exploring the Environment Teacher Page
Great Collection of Rubrics Resources from Saskatoon School District 
Harding University Rubrics Resources

Holt, Rinehart, & Winston Rubrics Collection

Midlink Magazine Rubrics Collection & Links

NCREL Rubrics in Technology Based on ISTE Standards for Teacher and Students
PBL (Project Based Learning)
Powerpoint Rubric
RCampus - FREE rubrics tools for educators
Rona's Teacher Tools
RubiStar
Rubrics 4 Teachers

Rubrics in Middle School - Understanding Rubrics
Rubrics Library from TeacherVision
Rubrician  (official website for links to rubrics; designed for educators, parents, students, and evaluators; includes all content areas)
SCORE Rubrics  (examples)

Teacher Planet Rubrics Collection
TeachersFirst.com Rubrics (click in search box and type Rubrics for many resources)
Teach-Nology
The Staff Room Collection of Rubrics (scroll down for resources)

Thinking Gear
UNI Rubric Collection 
University of Wisconsin Rubrics for all Areas
About.com: I didn't check these links, but here is an extensive collection of resources.