Create Your Own: When you click on "create your own" in the video box below, you're prompted to pick a persona and voice and type in up to 500 words. The result is a video like the one below. You're then able to email it, post it to a social networking site or post it to your own web site.
If you do create your own, feel free to leave a link in the comments to wherever you've posted it!
Thanks to John Kremer of www.bookmarket.com for sharing this with me.