If you want to create animations and interactive content for eBooks, websites, iPad apps, or literally any other medium, have a look at Aquafadas’ MotionComposer.
This $149 desktop application lets you combine text, graphics, photos, videos, buttons and shapes to create truly impressive interactive animations. For example, you can make text fly into or out of your animation, with control down to the individual letter. (The text effects are most impressive!)
When you’re happy with the result, you can export to HTML5 and Flash simultaneously, optimized for any viewing device.
Their website shows excellent examples as well as videos that show how MotionComposer works.