Wired Head

Kallout

KallOut is the first application to bring "selection-based search" to any web page, email, presentation, document, spreadsheet or PDF. Unlike other search methods that are trapped inside the browser, KallOut serves up content from the most popular sites on the web inside floating information palettes (which we call KallOuts). Using only your mouse, you can now avoid the disruption of launching a browser and let KallOut bring you the best the web has to offer.

Check out the intro on YouTube.