...service for any Internet user. Designed to replace the DNS services provided by ISPs or companies, Google says that its DNSwill be faster and more secure than many other DNSs, and won't filter content. According to the company's introductory...
http://news.zdnet.com/2100-9595_22-369875.html
...I certainly can't see what more can be done in our case since we can't, unfortunately, guarantee that reverse DNSwill always point to specific domain :( I am also considering allowing adding sites that will get secret key without verifying...
http://www.webmasterworld.com/search_engine_spiders/3983454.htm