2552 N. Maple
"A VoiceThread is a collaborative, multimedia slide show that holds images, documents, and videos and allows people to leave comments in 5 ways - using voice (with a mic or phone), text, audio file, or video (via a webcam). Share a VoiceThread with friends, students, and colleagues for them to record comments too.
Users can doodle while commenting, use multiple identities and pick which comments are shown through moderation. VoiceThreads can even be embedded on web sites and exported to MP3 players or DVDs as archival movies.
With VoiceThread, group conversations are collected and shared in one place from anywhere in the world. All with no software to install."
-From the Voicethread Website
VoiceThread has a protected K-12 section that requires you to be a teacher or administrator to apply. The free account doesn't allow you to create student accounts, but their are paid accounts that provide admin rights over student content and accounts.