A Google Docs demo account lets people collaborate in real time, but the content disappears after 24 hours. Good for short term collaboration, but not fully featured. via Lifehacker
Now avialable for the iPhone/ipodtouch, this program allows students to create drawings and text to create animations and stories. Nice. via Tony Vincent
"Collaborative multimedia presentations enable small groups like teaching teams to work together to:
. present knowledge in different and (if you do it right) compelling ways
. engage active participation by the entire class instead of broadcasting to it like a passive audience"