[krige]

If you mean the Nintendo solution I think the [system] Mini trend has finally died out for good outside of a handfull of pathetic outliers like Amiga 500 mini. At any rate Nintendo seems to prefer to release these things on their existing consoles, as emulated roms, as it's cheaper anyway.

If you mean third party solutions I think there is at least one project that aims to be compatible with various original cartridges but its name eludes me at the moment. [edit] It's Polymega though it doesn't support N64 it does support SNES/Megadrive/NES/TG16 and a number of CD-ROM based consoles.