I haven't actually tried Blinkx search tool to try it out yet, but it is supposed to be able to display search results based on "ideas" rather than keywords. It gets the idea of what you might be looking for based on the web pages, email, or other files you're viewing. It sounds a lot like the way Google scans the page to determine which ads to show for Adwords/Adsense. Although it is a downloadable app that smells like adware, the Blinkx website states that they are totally against spyware and adware. This is a little confusing since they offer advertisers space in their "shopping channel" which appears to be the only channel featuring commercial (paid) listings. However, they do offer the option to disable the ads. Is this the future of search? I don't know about that, but it is an interesting concept. I'll try it out and let you know what I think.
More info/download tool from Blinkx.com