A coder named Antonio Niño Diaz has released an extremely early DS version of the M.U.G.E.N. 2D fighter creation system (named for the Japanese word for "infinity"). How early? Well, right now it's just two Jump Super Stars-style Narutos in one environment. You can make one of the Narutos walk, punch, and jump, and you can make the other one move left and right with the shoulder buttons. It's a far cry from the insanity possible in the PC engine, but it's an exciting start.
We aren't sure if this is going to turn into a full-scale M.U.G.E.N. implementation (able to make Street FIghter-like games and platformers using user-designed characters) or limited to Jump Super Stars-type gameplay. We'd be happy with either!
[Via DCEmu; thanks, craig!]