|Is there an accessible version of VoiceThread?|
Yes, it's called VoiceThread Universal and it is friendlier to screen readers than the traditional VoiceThread interface. Access it at http://nccu.voicethread.com/universal/.
Below is a screenshot of VoiceThread Universal.
There is also a link for VoiceThread Universal at the bottom of the MyVoice page.
For more information on VoiceThread and accessibility, visit VoiceThread's web site.