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trnelson - 3:03 pm on Sep 14, 2007 (gmt 0)
"If your site publishes feeds of its content, this page will display the number of users who have subscribed to these feeds using Google products such as iGoogle, Google Reader, or Orkut."
I also noticed a "Subscriber Stats" option which I don't think I've seen before unless I missed it. I don't do any feeds at present so that's possible.