Voki

Voki is a free service that allows you to create personalized speaking avatars and use them on your blog, profile, and in email messages.

It is great for education because you can use it to record information about anything.  You can personalise the avatar that you create and allow it to speak through your writing(text), uploaded audio and even through your phone.

Voki

I have included a widget to demonstrate.  The link follows:

http://www.voki.com/