Google added the research tool to Google Docs presentations and drawings.
To access the research tool in Google Docs, Presentations, or Drawings just select it from the "tools" menu when you have a document, presentation, or drawing open. If you want to locate images that are licensed for re-use, open the "settings" menu at the bottom of the research pane and select "free to use, share, modify even commercially." Make that selection before conducting your search. If you use Chrome or Firefox you can drag images directly into your document, presentation, or drawing from the research pane.
Applications for Education
In addition to finding images on the web, the research pane in Google Docs now searches through images that you have stored and or shared in Picassa web albums and Google+ posts. If your students are using either or both of those services to store images the research pane could be a great tool for them to use to quickly recover and re-use their own content. And, of course, the research pane on its own is a good asset to students when they're designing presentations in Google Docs.