This mod won't exactly help you much with Street Fighter IV
or other button intensive games, but those that prefer to pass the time with the likes of Galaga
may want to strongly consider following the lead of our friend Mr. Pepsi Pants, and breath some new life into that NES Advantage controller collecting dust in your closet. Unfortunately, there doesn't appear to be a complete how-to available just yet, but the video after the break does demonstrate that this bridging of consoles is indeed possible, and no doubt simple enough for anyone with the necessary skills. What's more, it looks like an SNES Advantage mod is already on tap as a followup project, which should offer a bit more practicality while still maintaining some retro flavor.
[Via Nowhere Else