iTunes is Wrong
I have been lucky enough to be featured in iTunes in the Top Technology podcast page. In fact, they have me 'Featured' on the 'Tech News' page right on the front. Now this is very very cool.. except for one thing. My podcast isn't Tech News. It would probably fit in better under Software-how-to.
I am afraid to change anything or let iTunes know, since I don't want to lose my spot!
I've been prominently listed there for several months now. It sure is nice to get the exposure, however, I have to admit that have see my subscription rate plateau. One of these days something will prompt a flurry of new subscribers, but for now I feel like I am not going to be getting many new subscribers.
The Mac is a niche market, and I am doing pretty good with it. I reliably update the podcast almost every day, and I think this is helping me keep the subscribers that I do have. In the big scheme of things, with 40,000+ podcasts out there, my 2500 daily subscribers is pretty good.
Since the middle of the year, I have had almost 400,000 unique IP addresses pull down the show, and that is pretty amazing.

Comments
I'm doing that so, I'm not as worried (or obsessed with the number of listeners each day). We just need to keep doing what we do (which by the way you do a great job), and feel lucky to be a part of this citizen media.