People are lazy. They don't bookmark sites they're interested in and so on a continuous basis they type the sites name in a Google search field and search for the address. And voila Google serves up the address. But what they're really interested in is some information from that site. Google calls this phenomena "teleporting".
Based on this phenomena Google has introduced "search within a site" feature to their search engine results. So for certain queries you'll be presented with a second search box that searches just that site. This is pretty cool, but there's more to it than that. Below is an example. Say for some reason you wanted to search the New York Times but didn't have the address, fire up Google and it's the first result. But also notice the search box offered.
And now do your search within the 'search nytimes.com' field and get results only from the New York times site. Experienced users have known you could do this for some time. What's new is two things; first the ability to have that search box show on the Google search results page and second you will notice that targeted sponsored links show up on the right of this second search creating what John Battelle calls the "second click". The second click offers publishers highly targeted ad space and Google ultimately more revenue.
What are your thoughts on this new feature?