u dun need a gameshark, unless u wanna download cheats off the internet instead of puttin the numbers in one @ a time, most online retailers carrier sharkports or x-ports, i woudl go for the latter since it made by interact and now madcatz, anywho, all u need is ur memory card and any one of those devices and voila u can put replays and game saves on ur computer....but if u wanna load ur replays onto ur computer and watch them thats a different thing all together, u need a vga box, or a video card that supports vga, and ur gonna have to hook ur PS2 to ur comp, then ur gonna need a video capturing program, so u can record ur replays when u play em on ur comp