Gowans007 has posted a thread at the criminally misunderstood NeoGAF about an effort to mod Ocarina of Time to allow multiple simultaneous players. An early video of this can be seen at MetaCafe which shows a buggy yet impressive implementation. Currently the mod supports Dark Link vs Link deathmatch, and the mod’s creator Cen is hoping to incorporate a fully-fledged split-screen co-op mode. - - - -.
We will be updating you on any further developments, because we’re really kind and in no way conceited, but you can check out Cen’s original thread here.