The Chuckster has released a new version of the Atari 2600 emulator for the Nintendo DS, heres the info:
I integrated chism's FAT file I/O library into StellaDS to add the much needed support for high capacity flash memory devices. Create a directory called stellads in the root directory of your device and stash all of your ROMs in there. No need to recompile to get new ROMs! The buggy, awkward GBFS approach is no longer in use. Also, the menu now supports a near-infinite amount of ROMs thanks to the wonders of std::vector. Scrolling beyond the list works now as well. Directory traversal has not yet been implemented, however, so don't try selecting the dotted file names at the beginning of the list.
Included in the StellaDS download is a sample stellads ROM directory that you can copy onto your memory card to try out some free, public-domain Atari 2600 ROMs. Report any bugs to me via e-mail or on the forum, and have fun playing Adventure on your DS once again!