Tobuscus is really funny. I have been watching his playthroughs of SS and they are awesome especially because he's really bad at it and he does voices for all of the characters
Well, I've gotta cop out and say TheRunawayGuys. The combination of NintendoCapriSun and ProtonJon just makes it awesome. Besides, they're Mario Party LPs are hilarious!
Besides ZeldaDungeon (possibly DungeonGaming Network, well find out)
I would have to say this guy ToNotification (look him up on Youtube), he has a funny because it's stupid Ocarina of Time Walkthrough, but he's working on some new stuff that will be bigger and better! =D