Keynote can be used to create simple animations. You can use transitions such as the magic move, to create simple movements and special effects. You can use these for Keynote presentations or export them as video files and use them in iMovie.
With "My Queue" you can quickly save videos to watch later.
To add an item to your queue just click the sign next to the video.
Once you've added a video visit "My Queue" to start watching!