The latest version of DeSmuME has also successfully been ported to the PSP. The framerate is not in a playable state in any game, because everything is currently chucked onto the CPU and it is using a slow, unoptimised interpreter. However, Exophase (the developer of DraStic for Android and the GBA emulator gpSP) has said that while he reserves his scepticism due to the work involved, it should be possible to get some games running at good speeds! He's too busy to help us personally, but has given us the green light for using his GBA emulator code to get great emulation of the DS's second CPU immediately!