MIDP Zelda og perhaps Cell-da 🙂
joystiq.com has a post about a mobile version of the popular Zelda game. I’ve tried the game on my Nokia N70 and there’s an issue with the sound effects, but overall it plays quite well.
It’s not a direct conversion as far as I can tell or it’s simply because it’s a work-in-progress. The demo I tried was release in late june. There more information on this site as well as a download link, but the site is quite slow so I mirrored the jar file here.