Long story short, on current gen consoles its impossible (Ps3/360 i mean) For instance a Steroscopic 3D game on the PS3 which has been retrofitted to work at max capability to 3D gaming requires a TON of processing power because the PS3 is rendering the exact same HD image twice a the same time, which pushes the PS3 to the limit and prevents the 360 from running proper Stereo 3D.
Now imagine doing the same thing but with two completely different images and the requires processing power needed is 1.5x the prior level, let alone 3/4 split screen on a single PS3 or 360. your best bet is to brows PSN and XBL games with split screen, because if you want anything beyond a turok 2 port with split screen, your pushing your luck.
...uhh...ill just put my favorite quote of all time here.
"Welcome to Pain, the second of three...You have dealt the first...now deal with me!!"
