1. Vocaroo
http://vocaroo.com
Simple podcast
2. Voxopop
http://www.voxopop.com
Talk discussion board
3. Go Animate Edu
http://goanimate.com
Comic
4. Google Voice
http://www.google.com/googlevoice
Students call and answer ?
5. AudioBoo
http://audioboo.fm
Record and upload audio