For general information regarding speech and language therapy you can visit the American Speech-Language-Hearing Association's website at: www.asha.org
Super Duper Publications has created informational handouts for parents and teachers regarding a range of topics: http://www.superduperinc.com/Handouts/Handout.aspx?id=50
For information directed towards fluency:
http://www.stutteringhelp.org/
http://www.westutter.org/