Yesterday Barry blogged about Google testing a search box for site search within general search results. Today the feature is being fully rolled out for selected queries. It’s really an extension and elaboration of Google Sitelinks. The Google Blog explains:

[O]ver the past few days we have been testing, and today we have fully rolled out, a search box that appears within some of the search results themselves. 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.

Here are some examples:

Like The Story? Vote For It On Yahoo Buzz! Subscribe To Our Daily Search News Recap! Your Email: Send me the monthly search newsletter too! (Learn more about our newsletters and feeds)

Subscribe To Our Search Feed!

Share & Bookmark This Story!

By Greg Sterling Permalink
See Related Stories In Google: SEO, Google: User Interface, Google: Web Search