I am a massive RTS fan and the Nintendo DS is made for RTS action, heres a great new release from JimmyL:

First public release. v0.1
This is more a proof of concept than a game, but it's still quite playable.
Everything works perfectly on hardware, but it also runs fine on Dualis with the exception of transparency, but that shouldn't affect the game at all, and the touchscreen being off by about 16 pixels vertically.

Heres a screenshot:

Download this excellent looking new RTS game here --> http://nintendo-ds.dcemu.co.uk/dsrts.shtml