No-IP.com Provider of free DNS related services offering dynamic and static DNS services under various top level domains.
mydomain and mydns mydomain features include URL Forwarding, Path Forwarding, Email Forwarding and Title, Keywords, Description Meta Tags. mydns allows all of the mydomain features plus you can set hostnames, MX records, CNames, and SOA records - all free.
EasyDNS Provides DNS service for all .com, .net, .org, and country-level Internet domains. Puts you in the driver's seat of your domain's DNS with a complete suite of user-friendly, web site based, DNS management tools.
ZoneEdit You can use their DNS server free for up to 5 domains.
Network-Tools.com Microsoft recommends this site for verifying network configurations. Includes a Whois list of countries, Traceroute, Ping, Domain Name Server (DNS) Lookup, WHOIS, DNS Records Lookup, and E-Mail relay Check.
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