I came across this slide presentation a few days ago from the founder of Jaiku. It is really very interesting and sort of breaks micromedia down to an easy-to-understand concept and I think it not only provides good introduction information about services such at Pownce, twitter, and Jaiku but is also a great example of what a presentation should be: clean and simple.
I came across this on this French site. the original post is:
Pour comprendre le microblogging (phénomène Twitter), la dynamique des sites sociaux, le user-generated content, les objets sociaux, et le futur de l’interaction Web + Mobile, voici le slideshare qu’il vous faut !
French => English translation (done by myself, so if you identify any errors, please let me know)
To understand microblogging (phenomenon Twitter), the dynamics of social sites, user-generated content, social objects, and the future of Web+Mobile interaction, here is le slideshare that you need!
Created by the founder of Jaiku, a microblogging platform like Twitter, this presentation explains many things.