DNS Proxy is a small application that sits between you and your DNS server.
When it receives a request, it will try to match it against a banned domain list that you control. If it is a banned domain then it will return the IP you specify in a fake response. If not, then it will contact the real DNS server and proxy back the real response.
Also includes a list to display all of the unique host names your machine has requested and a count of how many requests per domain. Interesting to track what sites get called.