Full History Search is a feature Opera has had for a while. Safari saves the title, URL and the entire text of every single Web page you visit, into a database on your computer. You can then hit up a search for any word or phrase and Safari immediately displays all the instances of that search term from your browsing history.
We searched for 'headphones'. Straight away we were given several pages on CNET UK that contained 'headphones' somewhere on the page, along with a social network we were a part of in which headphones were mentioned in our profile. This also works from Spotlight in OS X, but strangely not from within the main search box inside Safari. Still, 10 points for being more useful than Cover Flow.
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