A VGM Player has been released for the NES by "mic". What's this then you ask? Well it allows you to play music created for the SEGA Master System on an NES. The zip archive contains a player som and a rom builder tool to insert SMS music into an NES ROM.
The 64drive N64 cartridge is still in the works, but here's a small "first impression" of what is to come. I just realized that there are features that I have not yet covered, but I really want the word (page) out there now, so stay tuned for an update soon :-)