As part of Google’s spring-cleaning announcement – the FeedBurner API has been shut down. Any application that requests subscriber information will fail to retrieve the data. This includes custom subscriber count widgets, and various iPhone apps – like Ego.
This does bring up the concern of what will come of FeedBurner over the next several years. Will the service slowly be phased out, or replaced by something else? I use FeedBurner myself, and I’m fairly certain that the majority of the feeds on my Blackberry’s NewsFeed app are FeedBurner feeds.