I usually find h3h3 pretty hit and miss, but his recent soflo stuff is cracking me up.
idubbz is ok, but it's weird. I have no idea why I like it. Same kinda deal with Filthy Frank.
I've watched some of video game dunkey's stuff, mainly linked from friends. mainly the dark souls stuff.

As immature as they are, and I imagine I'm gonna get a decent degree of fun made out of me for it, but I'm really into Game Grumps at the minute. I have them on in the background while I work or whatever.
AnimalBytesTV are sometimes kinda interesting. Mainly for their shit about snakes, helped a lot when I wasn't sure what kind to get.
Extra Credits are an amazing game theory channel. Some really interesting thoughts and opinions there about why various kinds of games work, don't work. They often delve into the psychology behind it too, which is probably the main reason I like them.
Dezeen Magazine is just a youtube channel for the design magazine dezeen. I check their site a lot, this thread made me realize I wasn't actually sub'd to them. Just a way to keep up to date with architecture related things tbh.