Todd is a veteran podcaster, the head of the Tech Podcast Network and author of . Todd is one of the old men in field and I have a lot of respect for him. That's why I can't understand how he can completely miss how hard it is to provide RSS stats.
Yikes! That's how web pages are counted, not RSS feeds. The difference is in the behaviour of a news aggregator vice a human surfing the web. I wrote an article on just this a while ago. Here's some of the pertinent bits:
Then we tried to apply the concept of unique RSS hits, but that not only has the same problems as unique web hits with respect to return listenership, routers are so much more commonplace now that hundreds and perhaps thousands of listeners can be represented by one single corporate IP.
Then we started mucking around with time intervals. If the same IP hits the feed in 10 minutes, it's the same guy. If it's 30 minutes later, we'll count that as a new guy.
This is very, very difficult stuff which is why there are only a couple of people in the podcasting space even attempting meaningful stats: Feedburner and Libsyn.
Read the rest of my article, here.