Google offers search within search
Imagine searching inside Wikipedia or Amazon.com, but on the Google search site.
Imagine searching inside Wikipedia or Amazon.com, but on the Google search site. Google's got a test going of a way to search inside different sites from within a Google Web search results page. If you type in "amazon," "wikipedia" or "new york times" on Google, it brings up the relevant result at the top and immediately underneath is a second search box. If you type a keyword in that secondary search box it will return results from within that site.
(Via Search Engine Land)