SWFUpload is a neat little tool that alows you to use Flash as a file uploader in your web forms. If your users have Flash, the script writes out a Flash uploader, and if they don’t, they get a nice HTML upload form field. Very nice, and it uses SWFObject for the plugin detection + embedding.
This is a great example of using Flash where Flash can do something better than HTML. And doing it in a way that uses progressive enhancement so it doesn’t require Flash. It’s just that Flash makes it better.