In the run up to Leopard Apple mentioned that they were adding support for more camera RAW formats, but it wasn't exactly clear which models would be supported. The final list is now available in this Apple Support Document. This means that native support for these cameras' RAW file format is in OS X and certain imaging applications, most importantly, Aperture. As it happens I was delighted to discover that my Panasonic DMC-FZ50 made the list after not being supported in Tiger. If you've been waiting for Apple to add RAW support for your camera you'll probably want to check it out.