Educational Resources Information Center (ERIC)- Clearinghouse in disabilities and gifted education

Family Village - Library of diagnoses from A to Z

LDOnline - Birth to six milestones and activities to encourage language

Ed Chapman's Speech and Developmental Delays Page - Production, pragmatics, expression, and receptive milestones for birth to five

Child Development Institute's Language Development Chart - Milestones for birth to eight years, and "Understanding and Supporting Language Development" for birth to eighteen years

Jennifer Fusco's Birth to Six Milestones and Speech Norms

Special Education Resources on the Internet (SERI)

National Information Center for Children and Youth with Disabilities