About 2 million images from the LIFE Photo Archive have been digitized and are available via Google Image Search. What is even better is that, over the next few months, the remaining 8 million images from the collection will be added. Many of these have never been published, so there ought to be some historically interesting and significant gems in this collection.
You can search the collection by using the above link, or add “source:life” (without the quotes) to your image search query.
via the Official Google Blog