Has anyone tried voicethread.com? If you have not, you don't know what you are missing. This is a wonderful program where students post a slide, picture, peice of work, math equation, etc and then they make discuss it through a microphone. Then after they give their presentation online through voicethread, their peers or teachers or whoever wants to or is given access, can make comments regarding the topic. It is wonderful. I used it as an end of the year summary, What I learned this year and the kids did a great job and the comments to each other were so productive, such as "Hey I remember learning about the parts of an atom, I also remember learning that the proton and neutron are in the nucleus." It showed student learning and peer evaluations, it was awesome. It is a free service but for classrooms it is best to an account and it is very inexpensive. I highly recommend this program, students of all ages can do this. It is great.
go to www.voicethread.com