PSone and TurboGrafx-16 games. Siliconera spotted updates to a number of classic NeoGeo titles, including Metal Slug, The King of Fighters '94 and Fatal Fury. All of these titles have been re-rated to include the PS3 and PSP.
Other NeoGeo games to appear on the ESRB database include Alpha Mission II and Baseball Stars 2. Like the listings above, these games also support both the PS3 and PSP. Hopefully, these downloadable NeoGeo games will feature the same functionality as PSone classics, specifically the ability to download to both the PS3 and PSP for no additional charge.