Quirky is still heavily working on a NDS port of Elite and released a new version.

Quote:

I’ve just cooked up a new release of Elite DS. This adds the music back in that I had to take out when my own GBA XM library proved too tricky/time consuming to port to the DS. I’ve updated the code so that it compiles with devkitARM r25 and the sound now uses devkitpro’s default ARM7 core.

http://quirkygba.blogspot.com/2009/04/elite-ds-version-06.html