If you are thinking about using any kind of audio to help build your cadence, you might be interested in the Zooming CDs. Below is a post I did about them from some other thread. I love the Zooming because it is all timed and orchestrated for a perfect 90rpm spin, but it is all a big breathing meditation, along with great prompts for all kinds of other things to work on, from relaxation of the shoulders to stretching the back through breathing, etc.

I am amazed at how long I can keep up a 90rpm spin using these, and how much it trains my breathing at the same time. Just a thought if you want something to use on the trainer.

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I haven't done much yet with podcasts, but along those lines, I REALLY like a cycling CD I bought and loaded onto my iPod. It is the Zooming CD from Ian Jackson. I ordered the set, which also has audio for both walking and running programs. I use the Zooming workout the most (it is specifically for cycling).

http://www.breathplay.com

I also bought a Spinerval audio only workout that I put on my iPod. It is a 45 minute high cadence interval workout. I think it is good.