Update []: As reported by Pants Pants Revolution, the DSPico flashcart is now available in pre-assembled form from Phenom Mods ($20) and Laser Bear Industries ($30).
It should be noted that the team behind the open-source project is not involved with these carts; they are produced by independent parties (something that is naturally permitted due to the open nature of the DSPico project).
Original Story []: A new Nintendo DS / DSi flash cart is on the way, thanks to LNH Team.
Designed by LNH Team, "a group of enthusiasts dedicated to preserving classic consoles and software, restoring lost hardware and creating innovative projects to keep their legacy alive," the DSpico project is comprised of two parts: the open-source cartridge itself, and an app launcher which is compatible with existing DS flash cart options already on the market.
All of the parts required to construct the DSpico are open-source, so anyone can make one – or modify and improve it.
For example, there's no infrared support currently, but the team behind DSpico has confirmed that a development port on the cart allows users to develop peripherals for the cartridge, which could potentially include an infrared expansion board.
Nintendo has traditionally taken quite a dim view of DS and 3DS flash carts in the past, but the open-source nature of DSpico might allow it to escape the Kyoto giant's legal gaze.
Flash carts allow users to run backups of games as well as homebrew applications, and are naturally viewed as devices which enable piracy by platform holders.