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encyclo - 2:31 am on Nov 10, 2005 (gmt 0)
Several of the web-based services using your feed give back subscriber numbers within the user agent string - it is a good basic measure of popularity. For example when Bloglines hits, you might see this UA in your stats: [b]Agent:[/b] Bloglines/3.0-rho (http://www.bloglines.com; 97 subscribers)