Okay, so there I was, sitting around and playing a few random games on MAME, when I decided to play around with the effects a bit. Some of them are very cool, like the scanlines and the feedback (two great tastes that taste great together!). Also, if you use a MAME variant, such as MAME Plus!, you can actually have different video modes (like 2xSai and Super Eagle).
So, my question for you is this: do you use these cool (but sacreligious) effects? And if so, which ones are your favorite?