National Center on Educational Outcomes:
http://www.cehd.umn.edu/nceo/
National Resource Center on Learning Disabilities:
http://www.nrcld.org
Society for Disability Studies: http://www.disstudies.org/
Disability Studies Quarterly (free journal of Society for Disability Studies): http://dsq-sds.org/index
National Center on Response to Intervention: http://www.rti4success.org/
National Center on Universal Design for Learning: http://www.udlcenter.org/
Center for Applied Special Technology (CAST): http://www.cast.org/