It's a caching dns server with 'sucking out' ads. It's very nice, but has some drawbacks. You have to kill SIGUSR1 the process to reread the file with blocked sites, where in adblock you just added an exception.
Blocking ads on DNS level sounds not too useful for me. What if you want to block just a URL pattern on a domain but not the whole domain (eg somesite.tld/annoying-flashy-banners/* or somesite.tld/tracking.js )?
I'm personally using adsuck: https://opensource.conformal.com/wiki/adsuck
It's a caching dns server with 'sucking out' ads. It's very nice, but has some drawbacks. You have to kill SIGUSR1 the process to reread the file with blocked sites, where in adblock you just added an exception.