What was added is the ability for folks to save the search phrases they discover while doing their research with a simple drag and drop operation. When you see a search suggestion you like, drag the suggestion to the book on the upper left and the page will store it using client-side-storage.
Client side storage is nifty because Soovle.com will never see the phrases you store and no personally identifiable information is needed to enable it. Just load the page and start using it. The storage stays in that spot until a user of that browser deletes it.
Additionally you can save the terms to a text file, email, and print them.