If there are any coders out there looking at this thread, might I recommend you look at this:
http://mednafen.com/
This is an emu that has been sitting quietly in the backround. It is a multi-emu, but can be compiled so that it only emulates one system.
Most recently, the PC Engine part of it was ported to the Xbox. I have to say it ran virtually eveything I threw at it....and it ran perfectly. Strider, Drac X, you name it, it plays it. WAV or MP3 is supported.
I hope this interests just a few of you.