Simple Feed Stats is a free WordPress plugin that makes it easy to track your feeds, add custom content, and display your feed statistics on your site. Simple Feed Stats (SFS) tracks your feeds automatically, and provides a wealth of tools and options for further configuration and management.
When I tried this, feedburner say I have 866 subscribers. Simple Feed Stats says I have 78. Meanwhile I'm getting 1400 downloads per episode.
For more information go to http://perishablepress.com/simple-feed-stats/