A list of DNS Tools to help you analyse your website.

IntoDNS

Analyses various aspects of advanced DNS and provides warnings for areas that should be fixed.

UltraTools

Quality DNS tools, including a Domain Health Report that tests a domains DNS for a range of common DNS issues. Requires free signup for access to full reports, but worth it IMO.

DNS Stuff

Basic free and paid service. Free tools include IP traceroute, Whois and IP location.