Your video download is now available in MP4 format to easily transfer to your iPod, iPad or iPhone.  When you receive your email from JibJab with your download links, you will see the option to download the original Mpeg file or to download an iPhone version or MP4.  
Once you had downloaded the MP4 file to your desktop you can then move it in to your iTunes:

1.Open iTunes

2.Click ‘File’ > ‘Add File to Library’
3.Find and select the video file and then click the ‘Open’ button
4. Your movie will then be added and you can find it in the ‘Movies’ section in your ‘Library’