Further to my thoughts about how to measure the growth of your readership, I hacked up a bit of perl which went sniffing for instances of %d reader(s) or %d subscriber(s) amongst my Apache logs, and boiled down the results.

/dropsafe/index.rss 46 readers via Feedfetcher-Google
/dropsafe/index.rss 38 readers via Bloglines/3.1
/dropsafe/index.rss 8 readers via NewsGatorOnline/2.0
/dropsafe/index.rss 2 readers via LiveJournal.com
/dropsafe/index.rss 2 readers via AlestiFeedBot/0.7
/dropsafe/index.rss 1 readers via Hatena
/dropsafe/index.rss 1 readers via Mozilla/5.0

/dropsafe?flav=rss 4 readers via Bloglines/3.1
/dropsafe?flav=rss 2 readers via NewsGatorOnline/2.0
/dropsafe?flav=rss 1 readers via Feedfetcher-Google

/cgi-bin/blosxom.cgi?flav=rss 24 readers via LiveJournal.com
/cgi-bin/blosxom.cgi?flav=rss 11 readers via Bloglines/3.1
/cgi-bin/blosxom.cgi?flav=rss 3 readers via Feedfetcher-Google
/cgi-bin/blosxom.cgi?flav=rss 2 readers via Mozilla/5.0
/cgi-bin/blosxom.cgi?flav=rss 1 readers via NewsGatorOnline/2.0

/ahm/blogs.sun.com-14d.atom 2 readers via Feedfetcher-Google
/ahm/blogs.sun.com-24h.atom 1 readers via Feedfetcher-Google
/ahm/blogs.sun.com-48h.atom 1 readers via Feedfetcher-Google
/ahm/blogs.sun.com-7d.atom 1 readers via Bloglines/3.1

/dropsafe/articles/project/index.rss 2 readers via Mozilla/5.0

/dropsafe/articles/security/index.rss 24 readers via Bloglines/3.1
/dropsafe/articles/security/index.rss 16 readers via Feedfetcher-Google
/dropsafe/articles/security/index.rss 4 readers via NewsGatorOnline/2.0
/dropsafe/articles/security/index.rss 1 readers via Mozilla/5.0
/dropsafe/articles/security/index.rss 0 readers via YandexBlog/0.99.101

The first three feeds are all the same data, supplied by different URLs, so that would make 146 readers subscribed to the top level feed via various aggregators. There’s probably some duplication in that figure, but the trick is not to care so much about that, as to measure its growth, if any.