Dozens of webmasters are reporting that their FeedBurner subscriber count numbers are dropping like flies, over night. There are dozens of threads on the topic, but the largest one is at Google Groups.
Some publishers are noticing drops from hundreds of subscribers to just a few subscribers. The biggest anomaly is TechCrunch, which is currently sporting zero subscribers, even Arrington twittered this.
I am sure this is just a temporary reporting glitch. It wouldn't be the first time. In October 2008 we saw a major reporting glitch and also in August 2008.
Forum discussion at Google Groups.