Today Google and Time Warner announced that they will be releasing millions of images from the Time-Life archive to the public. For many years most of the images have never been seen by Time-Life themselves let alone the public but Google have offered to host at least 97% of the images for anyone to view and download. The images themselves have their own page but they will also be put into the default image searches so you can find them easier when searching for a specific term.
As for usage, with most images that are taken by other people and submitted they can be used for personal and research use but they will contain a watermark so you can't go round posting them on posters or other websites, but if you so wish to buy the license you can from the image site.
RJ Pittman from Google said there are "three million images" currently hosted by Google (and maybe 7 million more over the coming months to years) and he also hinted that the design of the Time-Life system could be the future design for the Google Images part of Google.