One of Webheads suggested
http://voicethread.com/view.php?b=409>
which is a"an online media album that allows people to make comments,
either audio or text, and share them with anyone they wish. A
VoiceThread allows an entire group's story to be told and
collected in one place. "Creating VoiceThreads will always be free for
educators and the students that fill their classrooms. This includes
publishing them on the web, and sharing them with the child's friends
and family. It's really important to us that there are no barriers; no
cost to fully participate, no software to buy or download, and no
contracts to manage."

I am going to explore it soon and compare with other tools for digital
storytelling. Will let you know how I go.

Renata