I know its an old thread, but I wanted to show you that Graal in HD is possible.
http://www.youtube.com/watch?v=E5XsWbOohCY&fmt=22
It isn't really HD, its just uploaded in the HD format. A lot clearer than you think.
Its the best settings I found. Notice how it takes up the entire screen (no black edges)
I disabled the sound in the video.
Try
fullscreen mode too, looks really good on a widescreen monitor.