Google finally added the ability to restrict image searches to only images that are tagged with a Creative Commons license.
This feature allows you to restrict your Image Search results to images that have been tagged with licenses like Creative Commons, making it easier to discover images from across the web that you can share, use and even modify. Your search will also include works that have been tagged with other licenses, like GNU Free Documentation license, or are in the public domain.
Nice.
This is fantastic! Very useful to know right off the bat if I can use a pic!