Google Search Box with Search Results
Writing about web page http://googleblog.blogspot.com/2008/03/search-within-site-tale-of.html
Have you noticed Google's new search box feature? A mini-search box appears on search results of some large websites;
How it works...
When you search for a major website (not product) Google presents you with a mini search box as part of the result which according to Google:
increases their likelihood of finding the exact page they are looking for.
Although its been fully rolled out (on March 5th '08), some popular websites like Yahoo, Dixons & BBC don't seem to show up on search results. I however noticed academic & government sites like Warwick, Oxford, Transport for London & HMRC show up with the mini-search boxAccording to the official Google blog:
This feature will now occur when we detect a high probability that a user wants more refined search results within a specific site. Like the rest of our snippets, the sites that display the site search box are chosen algorithmically based on metrics that measure how useful the search box is to users.