For long, the A list bloggers like TC and RWW have complained about how pathetic FeedBurner has gotten over the last year or so:
http://www.techcrunch.com/2009/01/22/feedburner-needs-to-get-it-together/
http://www.readwriteweb.com/archives/feedburner_may_not_be_hearing.php
As a blogger who uses FB, I completely agree - but then whats the alternative ? The value FB provides is far outweighed by how much it really sucks these days. I would happily stop using it if it werent the problem of having the few thousand subscribers to update my feed url. FB has become like a pseudo-lockin - similar to the scenario where you dont really want to change your phone number because all your contacts have the current number.
I think there's potential for someone to start a competing service - where you charge a monthly fee for real time updates - a feature that is oft-needed by these top bloggers. Unpaid subscribers get their feed crawled at a slower rate.
Can you think of a way by which one could move out of FB with the least inconvenience caused to the subscribers.
Edit: Just found that FB provides a 30 day redirect option.
Also just read about FeedSqueezer @ RRW:
http://www.readwriteweb.com/archives/why_were_desperately_awaiting.php
If you're interested in discussing more about this, drop me a line.