I found this about a month and a half ago, so you may have seen it now - but if not, check out Ecolis, an incredibly appealing RTS for the DS. I am absolutely not an RTS player, but looking at these screens makes me want to buy the game right now. Cute sprite things in isometric 3D backgrounds with a chunky pixel map on the top screen...I'm sold! The character design is really solid too.
This is actually an internally-developed game from Interchannel (I believe it's internal anyway), which is what's left of the NEC gaming legacy. NEC had NEC Avenue for internal development before, and Interchannel for publishing and development...then Avenue disappeared. Then NEC Interchannel started to die as the dreamcast fell...then it got sold, and just became Interchannel. And now here we are, crossing our fingers that Ecolis is the second coming. It's coming at some point in 2007...