IDA Pro 6.2 came out last week. Among its features are these very interesting ones:
+ 65816: A 65816 CPU module (used in SNES consoles)
+ SMC: added a SNES rom loader
I guess I won't have to implement such a processor module myself, then. =) Previous versions came with the source code for some Hitachi microcontroller that I quickly recognized as being pretty close to the 65816, so I guess it wasn't too hard for them to make it.
I haven't had a chance to try it yet, since I only have IDA at work. =(