Of course there are many more emulation docs out there than I have here. If you happen to have a particularly good doc, feel free to send it to me.

Chip FX esnes	This is the short, sweet, and confusing information about the Super FX chip. It really doesn't say much, and it's above and beyond me anyways. I don't know if it's useful or not.
Sound Encoding Scheme Butcha	This is information regarding the Bit Rate Reduction encoding scheme (BBR) as described by Butcha.
SNES Documentation Version 2.30 YOSHi	YOSHi's SNES docs, just as good as his NES docs, probably better. Wonderful documentation for the SNES system.
SNES Memory Mapping Version 1.0 ]SiMKiN[	SNES memory mapping, just as the title suggests. It is a good doc, or else it wouldn't be here.

Rom Hacking

Anus Pee's Advanced Rom Hacking Document Version 1.2 Anus P.	This document deals with how text is stored, headers, pointer tables, moving text, and physical rom expansion.
SNES Graphics Info Version 1.0 DAX	This is a very old doc. In fact, it may very well be the oldest doc I've ever come across. This describes things that are well known today, but was cutting edge knowledge in 1993. It really shows that we have come a long way in only a few years, but it is still very acurate.