run your own named/bind9
I host the doubleclick.net domain as a master as well as sedoparking and hosts of others.
Stops so, many adverts including breaking many forced-flash ads.
[root@dieter ~]# cat /var/named/doubleclick.net.hosts
doubleclick.net. IN SOA gate.localnet. ....... (
doubleclick.net. IN NS gate.localnet.