I’ve been messing around with the FeedBurner Management API. It will let you list, create, modify and delete your “burned” feeds. It’s nice and simple and I have a couple of cool things in mind that would take advantage of it’s features.
However I did not find any PHP implementation, that’s why I wrote my own. 
Feel free to use and modify the code.
It passed 2 years since the moment you wrote this code. I founded today after I spend more than 5 hours trying to figure it out how to use those API functions. Mmmm… yeah, I’m just a newborn in this domain compared to you but I wanted to thank you for what you did. I know how hard it is to write code, working code and that’s why I’m here, on your blog. I don’t know how many others used your work but be sure that it’s usefull and at at least one of those out there is grateful to you.
Good luck and all the best.