I just got done watching Cosmo play Ocarina of Time on Twitch.tv, where he, after many, many tries over the course of the past few months, managed to beat the current world record. You can watch the run, which is 18 minutes and 29 or 30 seconds long on his Twitch.tv channel.
For those new to the game or speed running in general, he uses various glitches and techniques to skip a huge amount of the game such as most dungeons except for the Deku Tree and even the sword. I'm not super knowledgeable about that stuff, so don't ask me how it works, but it's still super impressive since it involves two especially hard skips (getting past Mido in Kokiri and clipping through the castle at the end.) Also, the device he uses is the iQue, a Chinese gaming system/controller, one of the reasons he uses it is that Chinese text is faster.