check out tokyomonsters.com. They have a whole section about how to make your own backups of a dvd with your own subtitles. It's a Godzilla/Japanese giant monsters & robots fansite that has directions on how to make your own backup copies the japanese R2 godzilla dvds (which have no english subtitles) with english subtitles, which are downloadable from the site. This, of course, assumes you already own the official disc. While i doubt he has any premade star wars subs for download, i'm sure it would at least get you going...