Ideas for the woefully underserved NeoGeo library (in addition to some SNES ports):
Hacks which address the bullshit difficulty in Fatal Fury Special, World Heroes 2, and King of Fighters '95
Hacks which make the hidden characters selectable in the following games: Fatal Fury Special, World Heroes Perfect, The Last Blade, King of Fighters '95, King of Fighters '96, King of Fighters '98, Real Bout: Fatal Fury 2: The Newcomers
Semi-related: Hacks which add the original NeoGeo BGMs and SFX to the following SNES ports: Art of Fighting, Fatal Fury Special, World Heroes, World Heroes 2, Samurai Shodown
Finally: A hack which removes the censorship from the SNES port of Art of Fighting in addition to fixing the background for Jack's stage (making the woman's jacket actually look like a jacket instead of a weird jumble of tiles around her waist, adding graphics for the floor tiles)
Also, a proper localization for Garou which fixes the myriad spelling and gramatical errors, possibly cleans up the dialog a bit so it actually makes sense, and drops the horrid Khushnood Butt name in favor of Marco Rodriguez.