QUOTE(shadowfall @ Nov 9 2006, 11:05 AM)

I don't know a stable emulator, but I really want to be able to play final fantasy III for ds on my tv, The tiny screen for a final fantasy game just doesn't work for me.
A DS emulator will never happen for a variety of reasons. Doing a quick Forum Search will reveal:
There is no DS emulator out there that can run commercial roms. Even if it existed, it wouldn't run at a decent speed on XBox hardware, there would be no good way to handle the touch-screen controls on the XBox, and no good way to do the two screens.
That being said, if all you want to do is play FFIII on your TV, that is easy.
Play the original FFIII NES game with a translation patch, or just find the already patched translated ROM. It is against forum rules to tell you where to find ROMs exactly, but it really isn't hard to find.
For more old school Final Fantasy games, with improved graphics even, look for Final Fantasy Origins, Dawn of Sorrow, Chronicles, Collection, Anthology, etc.