Most iPhone Apps that I share in my presentation will have more than one way to share your creations. Some will be best to save to your photoroll then transfer to iPhoto or your photo folder on your computer. Others can be emailed to yourself, uploaded to sites to either share the link or get an embed code.
I always be sure that I can easily use my media creations that I make on the iPhone. Check out the sharing possibilities of the app and choose which one will work best for your project.