Hi,
a friend just shared this tool with me
*"SlideWiki aims to exploit the wisdom, creativity and productivity of the crowd for the creation of qualitative, rich, engaging educational content.* With SlideWiki users can create and collaborate on slides, diagrams, assessments and arrange this content in richly-structured course presentations."
Tt seems interesting
An example
http://slidewiki.org/deck/1472#tree-1472-deck-1473-1-view
I'll try it on my next presentation. :)
Tom