American Speech/Language/Hearing Association
http://www.asha.org/

Kaufman Children's Center for Speech/Language Sensory Disorders
http://www.kidspeech.com/

National Coalition of Auditory Processing Disorders
http://www.ncapd.org/
 

Speech/Language Milestones Chart
http://www.ldonline.org/ld_indepth/speech-language/lda_milestones.html

The Center for Autism
http://www.autism.org/

The Stuttering Foundation of America
http://www.stutteringhelp.org/

Speech Delay.com
http://www.speechdelay.com/