I tested to express my though by Prezi. It is a presentation tool, in which you have a very big canvas for presentation material instead of a pile of slides. I like that idea.
In overall, Prezi is pretty nice tool even if the user interface is a bit clumsy (except if you use only text). I have to say that creating presentation by PowerPoint is faster and easier, or… perhaps, I just tried to do something too cool and difficult.
Unfortunately, I was unable to embed the presentation here. Anyway, here you have link to it (if you have slow internet connection, prepare to wait. The size of presentation is 16 Mt):