Today (22.01.2009) we have noticed our feed burner count whent down to zero. We knew it was something to do with
FeedBurner counter display as we could see the number of
FeedBurner count stay the same when we log in to the account.
Lately found out even in official Google, Gmail blogs
FeedBurner count are dropped to zero. It must be a small bug that affect everyone and they will fix sooner.