Presentics (free, but a full version is available for US$9.99) is a fascinating presentation app for the iPad. Once you get the hang of it (more about that later), you can spin up some very nice presentations that work on your iPad alone or when it's connected to a big screen or projector.
The app has some innovative features, and there are some attractive examples to help you get started. Presentics allows you to draw on screen in real time, or import just about any media or text from the web, Dropbox, Google Drive or your own media already on your iPad. There is support for images, video clips, audio clips, documents (PDF, HTML, Word, PowerPoint, Pages, Keynote) and web pages, along with streaming media if you have an internet connection.
Extensive help is built into the app, but I had real trouble getting started with only a cursory glance at those help files. Building a presentation did not seem to have a natural flow, and it was unclear what some of the program buttons accomplished. After a few tries, I understood how it worked, but a video tutorial that starts from scratch and takes the user through an initial presentation setup would be extremely helpful. There are some videos on the developer website, but not in the app itself. I think most first-time users will be baffled about how to get started and what to do next.