This free app handily shows Powerpoint presentations and it displays your notes when you run your slideshow. It’s also a breeze to get your presentations into SlideShark; you can upload them to the SlideShark site, which the app syncs with; or you can grab them from Dropbox or Box.
http://chronicle.com/blogs/profhacker/slideshark-is-the-presentation-app-to-beat/43852