Actually, you haven't. Blogspot merged with Friend Connect and in the process those who used Friend Connect were "dropped" as an active follower from your blog until they follow you again. They are still getting your blog updates, they are just no longer active followers. Thanks to Amanda who let me know through twitter. For more information on the issue, check out this link.
And just because I hate to not post a picture, this is my oldest hamming it up at the park.