I just found a great new emulator: BSNES. It emulates the pants off of SNES9X. Maybe it isn't this wasy for everyone, but SNES9X for me always had framerate issues. Not in the way that the game itself was actually lagging, just that the motion was choppy. Most noticeable in sidescrollers; it seemed the screen did not scroll smoothly. Also the sound timing was off, it always seemed like the music had trouble staying at the right tempo for me. BSNES does both of these things perfectly. Also it even emulates several other systems, NES included and some others, but I haven't tested those to see if they are as good.