Voicethread

Voicethread - http://voicethread.com/
Voicethread for Educators - http://ed.voicethread.com/

Tutorials:
What is a Voicethread?
Language Learning Tools
Voicethread Tutorial
Voicethread Tutorial 2

Links:
VoiceThread Extends the Classroom with Interactive Multimedia Albums
Digitally Speaking
*VoiceThread - Hear One, Do One, Teach One
Voicethread4education Wiki
Voicethread Ning
Free Tech 4 Teachers
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Examples:
Voicethread Examples
http://smithvt2.wikispaces.com/
http://moritzs.wikispaces.com/PoetryMoritz4