If you are using Google Reader to read this, you have under three weeks to migrate to another platform (Feedly looks like a good bet) before Google pulls the plug on it.
I try not to get too involved with monitoring stats but since Google Reader is about to disappear, it's somewhat interesting to compare the popularity of different RSS feeds (note that one blog may be available through several RSS feeds) based on the number of Google Reader subscribers. This is available from Google Reader if you subscribe to a URL and then click 'Feed Settings' and 'View Details and Statistics' (I think this value may even be available programatically).
For example, for this blog, the URL http://baoilleach.blogspot.com/feeds/posts/default has 132 subscribers. That's a good number when you consider that In The Pipeline's http://www.corante.com/pipeline/index.xml has 1543. But to put things in perspective, xkcd's http://xkcd.com/atom.xml has 246,701. :-)