We're maintaining an online-only article called "" to bring together news of products that have been updated for Leopard compatibility. It doesn't make sense to publish this article in the email editions of TidBITS each week, since it changes constantly, so  for updates, or subscribe to our RSS feed using a program like NetNewsWire that can call out changed articles. We're focusing on products we consider important or interesting, which means things that we've covered in the past or are thinking about writing about in the future - there's no way this list could hope to be comprehensive. That said, if you know of something that's not on the list but has appeared in TidBITS or Take Control in the past, let us know so we can add it!
While you're at our Web site, be sure to notice our new Leopard Information Center in the upper right, with links to all sorts of useful Leopard-related stuff we've done, including the Leopard Compatibility List.