Useful tools

Some useful diagnostic tools

DNS

Squishywishywoo: complete dns traversal checking
"DNSCheck is a program that was designed to help people check, measure and hopefully also understand the workings of the Domain Name System"
"The ZoneCheck program (freely available here for download) performs several tests on your zone (ie: domain) to ensure that it is correctly configured and can be safely delegated, providing a certain quality to your domain"
Verisign DNSSEC Analyser