If you have a blogspot blog and use feedburner, you should integrate (redirect your feed) to feedburner through their new integration. I did it yesterday and my count more than doubled in one day. I had always suspected that the count was too low, and I thought that was the reason. But I never thought it was as bad as it was. Here's the announcement from feedburner, including directions on how to do it. Note that your count won't update until at least the next day as people use the feed.