Overview

http://en.wikipedia.org/wiki/VXML

http://www.w3.org/TR/voicexml20/

Element References

http://docs.voxeo.com/voicexml/2.0/  (Voxeo)

https://studio.tellme.com/vxml2/ref/elements/ (Tellme)

Community

http://www.voicexml.org/ (VXML Forum)

Tutorials

https://studio.tellme.com/vxml2/ovw/ (tellme)

http://cafe.bevocal.com/docs/tutorial/tutorial.pdf (bevocal PDF)

http://docs.voxeo.com/voicexml/2.0/frame.jsp?page=tutorialhome.htm (voxeo)

http://cafe.bevocal.com/docs/tutorial/index.html (bevocal HTML)

Resources

http://cafe.bevocal.com/libraries/audio/ (bevocal wav file repository)

http://www.w3.org/TR/voicexml20/vxml.dtd (w3c vxml 2.0 DTD)

http://cafe.bevocal.com/resources/voicexml_samples/index.html (sample vxml)

Tools

http://www.voxeo.com/prophecy/ (Complete VXML Platform in a box for Windows)

http://evolution.voxeo.com/ (Host your VXML app online - very easy to get going!)