"Methodology
Firstly I found a list of the 1 million most popular sites. I then picked a number of DNS servers to test against. I chose Google's, OpenDNS's, my ISP (Sky/Easynet) and my old ISP's (Plus.net).
"I decided I would query an A record for each of the domains in the list, one at a time, starting with the most popular. I would query each server three times for the same domain name. The ordering was like this:
foreach (domain)
for (i =0; i<3;i++)
foreach (server)
query(server, domain)
