Pixelman is an sprite editor which will work directly on your Nintendo DS!

Changes:

– Added one option to top screen, press gear icon to turn top options on when screen is switched.
– Press little icon near corner of palette to enable palette size changing. 8×8 blocks max, 2×2 min. Press same icon to stop.(small note… believe it or not, both the palette and any loaded bmp are on the same 16 bit layer…)
– More Options button on Options screen is in progress, right now does the same thing as Done…
– You can now see as many files as you want in the sprites, palettes, and bmps directories. Can’t go into other folders though…
– Fixed a couple of minor bugs, and one that kept multi-frame sprites from updating correctly…
– Hold fill icon for about 1 1/2 seconds to go into persistant fill mode. Press again to stop.
– Hope I didn’t forget anything…

http://forum.palib.info/index.php?topic=5230.0