I think KRIKzz should tackle the Nintendo DS next.
It looks like the Chinese DS flashcart scene has been slowly dying down though
www.r4isdhc.com is still alive and kicking. EZ-Flash has stopped making DS flashcarts and has moved on to making GB(C) and GBA flashcarts.
It would be great for KRIKzz to step in to claim the DS flashcart scene with a superior product that has the best compatibility of any flashcart, DSi Enhancement and DSiWare support for DSi models, support for TWiLight Menu, Slot-2 support with an additional cartridge for pre-DSi models and many more features.
Maybe call it the EverDrive-NDS and give it an additional Slot-2 cartridge called the EverDrive-NDSPlus which has GBA ROM support with RTC (the games will be accessed from the Slot-1 SD card), rumple pak and expansion pak support. It can even have GBA-DS linking features with certain games like Pokémon Mystery Dungeon and Castlevania: Chronicles of Sorrow.