I used to love DNSStuff.com until the started charging $70+ per year to run DNS tests from their website. So tonight when looking for a way to show a customer that a connection issue was due to their DNS, I found intoDNS.com. Their interface is easy to use and very similar to the old DNSStuff.com.
Woohoo! Thanks to intoDNS.com for helping the small server admin save money!