An app I recently became aware of and started using is SlideShark. This is a fantastic app if you are looking for a way to present from your iPad using a PowerPoint. This powerful app has lots of features including presenter view with notes, live slide annotation, broadcast and sharing capability, and a remote option.
Teachers at Butler Middle School just started using this app in conjunction with their iPads and AppleTV. Teachers create a free account online and upload their Powerpoint presentations, or save them in cloud storage (Google Drive, Dropbox, etc). Then, you connect to your AppleTV and iPad via Airplay, and open the app. Your presentations appear in the app ready for use! The teachers at Butler love the mobility and flexibility the app offer.
This video walks you through how to use the app and how to upload your PowerPoint Presentations. Best of all...it's free! Check it out!