You can get RSS statistics.
If you host your own RSS feed, you can parse the IIS or Apache logs to find all requests for the feed, and then do some processing to aggregate the data on each machine.
If your feed is hosted on any blog, it usually offers some basic statistics.
You can also use Google FeedBurner to create an RSS feed that basically redirects your real feed. FeedBurner provides really good statistics and also supports other interesting features.
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