Contextual Search would be handy on desktop, both for end users and for Touch-To-Search developers.  One UX would be to trigger on right-click just like the current "Search Google for <selection>" but the Contextual Search infrastructure would make a server request to determine what to search for.  The resulting search would be opened in a new tab just as we do now for Search Google.

This might be fun for a "Make it Better" week.