Speech Synthesis at Open Directory Project
http://dmoz.org/Computers/Speech_Technology/Speech_Synthesis/

SpeechTEK
http://www.speechtek.com

Klatt, History of Speech Synthesis
http://www.cs.indiana.edu/rhythmsp/ASA/Contents.html

Comp.speech FAQ
http://www.speech.cs.cmu.edu/comp.speech/

International Speech Communication Association (ISCA)
http://www.isca-speech.org/