Konami's PSP remake of Metal Gear Solid: Peace Walker HD Edition will feature online multiplayer through PSN and Xbox Live. This will act the same as any other Xbox Live or PSN game, in that you do not need to do any crazy PS3-PSP black magic to get it to work. the games will also run in 60 FPS, even with 4 players.
Source: Joystiq
too bad they arent releasinga pc version :/