Check out "Present it" for an Ad-free version.
Present It allows you to show PowerPoint® presentations (*.ppt & *.pptx) right from your iPhone, iPod touch, or iPad WITH SLIDE TRANSITIONS AND VIDEO OUT SUPPORT. Works through any app that supports the "Open In..." feature, as well as iTunes file sharing. After a one time rendering, your presentations will open with ease. Connect to a tv or projector with the HDMI or VGA adapters and share with any size audience, or connect to Apple TV with your iPad 2 or iPhone 4S to show your presentation wirelessly. A presenter view shows you whats coming up before youre there so your presentation is never side tracked.
Features:
-Present PowerPoint® presentations on your iOS device or on an external display
-AirPlay video out support for iPhone 4S and iPad 2
-Support for custom slide transitions (native transitions and animations are not supported, however you can choose from three transitions or random. More transition choices coming in a future version)
-Presenter screen with current and next slides when displaying on an external screen
-One time rendering does all the heavy lifting so your presentation runs smoothly
*****Note*****
For larger PowerPoints®, please allow up to 30 seconds for the rendering to start. Again, this will only occur the first time. If you cancel the rendering, and later the file opens incorrectly, press the trash icon and delete the cache. Then try the rendering again to correct any errors. Please feel free to report any issues at cabdeveloper.blogspot.com.