Anon has generously created and shared a demo of a Web interface for their version of the Pi-hole. It is the same concept: using dnsmasq and a Web server to block ads. What’s different is that it runs via PHP and uses a database to store the entries so it can be modified from within a browser. The project is up on Github, and I hope to collaborate to eventually create a Web interface for the Pi-hole.
The demo site displays a nice table of all of the ad-serving domains that are blocked. It also shows if the domain was blocked as part of the auto list or custom list. The checkbox allows you to block/unblock the domain.
You can sort them in different ways.
There is also a nice status page where you can see stats and even restart services or update the list.