Just heard the news that Google is testing out a new feature in the search results pages. It’s a search box within the search results, directly below the site snippet. It allows searchers to search the entire site where the snippet has come from. Kind of like site search, but off-site. This only works for a few authority sites at the moment, including Amazon, NASA, Wikipedia and the New York Times, but apparently it will be rolled out on a larger scale shortly.
You can read more about it on the Google Blog.