Looking at the featureset of these frontends, my own implementation pales in comparison. It would need a lot of work before matching the features these offer.
I've rolled my own very basic PHP frontend to my own SQLite-backended self-hosted PowerDNS setup. If there is serious interest, I might just throw it up on Gitorious or Github as I've always intended.
If you finish it let me know. I would be interested in possibly buying the front end from you (even if it's rough wouldn't be customer facing.)