This plugin will show the number of subscribers according to FeedBurner/Google. Important: WordPress 2.7 and up.
Ever wanted to see your FeedBurner stats on the WordPress Dashboard? Well now you can with this simple plugin. The plugin uses FeedBurner's Awareness API to get your feed subscriber stats directly from FeedBurner. So now you can easily check your subscriber stats from the WordPress Administration section.
-Graphing of stats from 01-01-2008 to the present.