Thanks, Rob, you've saved me a job. I was going to tip people off about the entire Life photo library being available, having just read about it on a fishing blog.
I think the great thing about so many of the photos is that they are wallpaper size for the average computer. Not only are B&W pics often more powerful than colour but they also make your application icons stand out!
Any baseball fans planning to use this amazing resource, incidentally, should write off the rest of the day...