I've stumbled across a web site with a large collection of movie stills and publicity photos of movie stars, mostly from the 1940s and earlier. It's called Dr. Macro's High Quality Movie Scans, and they are high quality, indeed. For example, here's a 708K head shot of Bogart, 1791x2151 pixels. And here's Betty Bacall to keep him company. I'm quite impressed with Dr. Macro's work, and the whole site. There's also a generous assortment of film clips (.wmv files), but I haven't downloaded any, being on dial-up.
Go out now get wet.