For a limited time only Changeip.com is giving users the ability to participate in a program that gives free DNS for all your domains in the program! For each domain that you link to them from your domain, Changeip.com will give 2 months of free DNS service. These domains will receive free DNS with no ads, banners, pop-ups, or any marketing. And as long as you link to them, they will extend the scheme for your domain.

As a bonus, you can even move your Network Solutions domain name to their service for free.

Check out their complete terms and conditions on Changeip.com