Usage statistics

Podtrac – They are motivated by a desire to connect your podcast with advertisers, but they do offer some use-statistics for free.

Kiptronic – They are motivated by a desire to connect your podcast with advertisers. It is not clear if they offer some use-statistics for free.

Podbridge - They are motivated by a desire to connect your podcast with advertisers. It is not clear if they offer some use-statistics for free.

Audible’s Wordcast – Audible is a provider of electronic books. They offer a service whereby for three cents per downloaded podcast, they will report if the downloader listened, and for how long.

Feedburner – If you use Feedburner for your RSS feed, they can provide numbers for feed circulation, what kind of aggregator users use and number of click throughs (streaming / downloading from your blog rather than through your RSS feed). You can get more services if you pay.