I used to use the DNSReport from DNSStuff.com, but it seems like they are making it harder to use. I researched some alternatives and I came up with these two that I liked the best:
IntoDNS: http://www.intodns.com/
World Wide Web Domain Tools: http://w3dt.net/tools/dnsreport/
Here’s a more exhaustive list with reviews of free alternatives to DNS Report.