In the World of Speech Therapy

slp123.blogspot.com - best for grades k-3, has a great summer language calander to download. 

http://www.quia.com/shared/speech_therapy/

http://jillkuzma.wordpress.com - specifically geared to older students with autism.

http://www.practicallyspeeching.com

speakingofspeech.com/language_materials.html