Let's start a new trend! I invite you to subscribe to the first truly closed-captioned podcast. I produce "tecnocato" and it is now closed-captioned. I also post the transcripts (from the captions) in the podcast's website.
If the response is positive, I am seriously considering making an episode to show how to make your your own closed-captioned video podcast.
This is not officially supported by iTunes but it works... let's hope that they add more functionality in the upcoming upgrades and devices.
In the mean time, you can subscribe at http://www.tecnocato.com
Hope you enjoy it.