Does anyone know a way to perform the following:

I want to know whenever a new domain starts appearing in the google search results for a particular query.

For a given google search query, I'd like to receive an alert whenever a new domain pops up and starts appearing in the search results for that query.

Alternatively, it would be great if you could just sort google search results by the age of the domain, making it easy to find new sites.

As far as I can tell you can only sort by when the page was "last updated".

Is something like this possible?

EDIT: Following John's suggestion of Google Alerts. The problem with Google Alerts is that it sends you any new PAGES appearing in the search results, not just new DOMAINS.