Here's what I want to know: who are the people out there that choose which podcasts to listen to based on their rank on a website? The design and functionality of Podcast Alley is not set up to facilitate someone finding new podcasts to listen to, and as such I postulate that the people who visit that site with any regularity do so solely to vote for whatever podcast they're ALREADY fans of. You know what it all reminds me of? Those clickthrough websites from back in the 1990s which were all about THE TOP WAREZ/XXX/MP3 SITES, with the rankings having no real bearing on the site's popularity. Other than maybe the iTunes Top Whatever listings (which is dominated almost entirely by professionally produced/radio show archive type podcasts), I don't think podcast rankings really reflect the popularity of a given podcast. Heck, I'm living proof! You didn't really think that more people listen to my show about obscure Japanese cartoons than they do Scott Sigler's audiobooks, TWiT, Grammar Girl, Firefly Talk, et al did you?
I speak only for myself here, but I think that podcast success shouldn't be measured in listenership anyway unless you're trying to use podcasting as a means to make money, be it directly through ads/merchandising or indirectly through book deals or otherwise getting hired to do something. That seems to be a prevailing attitude though among many who consider the chief appeal of podcasting to be that it's effectively like Tivo only for radio. And sure, it's awesome that you can listen to archives of past podcasts whenever you want, but what really makes podcasting great to me is the fact that
it doesn't matter how many people listen. Anyone can make podcasts about any subject they feel like, and ratings be DAMNED. Hell, I just released a podcast where I did nothing but
listen to middleaged/senior citizens talk about the cartoons they grew up watching. That's the freedom which podcasting grants us: any random guy can grab a mic and talk about a subject of EXTREMELY limited interest, and that's okay!
Podcasting isn't a great big popularity contest. If your goal of podcasting is to become popular on the Internet, just forget about [audio] podcasting becuase the total number of people listening to audio podcasts is a drop in the bucket compared to the amount of people watching streaming videos. In fact, I'll bet that if you added up virtually everyone listening to audio podcasts currently it wouldn't exceed the amount of views received for even a single Youtube video that's rated as "Most Popular" for that day (ninja cat, certain SNL skits, dramatic gopher, "Unforgivable," Rick Astley, take your pick). So if the numbers are all you're in it for, grab a video camera and shoot some wacky videos instead of obsessing over rankings on a podcast directory.