On value-added modeling:
Economic Policy Institute
http://epi.3cdn.net/b9667271ee6c154195_t9m6iij8k.pdf
RAND
http://www.rand.org/pubs/technical_reports/2010/RAND_TR917.pdf
Brookings Institute
http://www.brookings.edu/reports/2010/1117_evaluating_teachers.aspx
Center for American Progress
http://www.americanprogress.org/issues/2010/12/student_teacher_eval.html
http://www.americanprogress.org/issues/2009/12/pdf/value_added.pdf
Annenburg Institute of School Reform
http://www.annenberginstitute.org/pdf/valueAddedReport.pdf
On Evaluation Systems
The New Teacher Project
http://www.tntp.org/index.php/publications/issue-analysis/view/teacher-evaluation-2.0/
The Center for Teaching Quality (A personal favorite)
http://www.teachingquality.org/tsp4p
National Board Resource Center
http://accomplishedcaliforniateachers.files.wordpress.com/2010/05/act-a-quality-teacher-in-every-classroom.pdf
On Merit Pay
National Center on Performance Incentives
http://www.performanceincentives.org/data/files/pages/POINT%20REPORT_9.21.10.pdf