Das

Angry Joe.

das24680 (as mentioned above) is probably my favorite

i also like quill18, arumba and pewpewchewchew

I hear those guys at eXplorminate are doing pretty good!

Das is alright but he plays too slowly for me. Quill18 and NorthernLion are good, though.

AngryJoe, TB and Maestro Cretella.

Haven't seen one of their videos in months now. Guess I'm having a break ^^

Good stuff so far, thanks.

das24680 - Strategy games

quill18 - strategy games and development videos (quill18creates)

tectoss - Endless Space and Endless Legend. He's starting to go deeper in strategy talk by devoting episodes to understand why he chooses one strategy or another.

SBFMadDjinn - Civ5, EU4, did some FE:LH videos in the past. He goes into detail why he chooses his strategies. 

Day9TV - Starcraft 2 broadcaster

TotalHalibut - Total Biscuits channel for reviews on just about anything. If you are looking for honest reviews check here.

sl1pg8r - Only because of the silly music in his Cities : Skylines videos

Boogie2988. Looooove him. 

https://www.youtube.com/user/boogie2988

Ohmwrecker

Northernlion

Wayward Strategist

CaptureRapture

ZeroEmpires

Interjection

Dad's Gaming Addiction

Black Adder's Plays

BBQTurkman

Resonance22

Brotatoe is one of my favorites.  Not sure if he does strategy games.

Totalbiscuit - Great mechanical analysis and meta industry coverage with a solid ethical stance and no bullshit.  Fun commentary while playing.

Quill18 - Great gameplay videos and pre release coverage.  Often in depth videos likke the recent "mechanics of Pillars of Eternity".

SirTwiggy - Great for survival games.  Twitch, not sure about Youtube.

Jesse Cox - Fun gameplay, variety of games.

Dodger / Press Heart to Continue - Fun gameplay, weird games.

Angry Joe - Good in depth reviews, fun gameplay.

Sjin, Sips, Hatfilms, Duncan, Kim from Yogscast.

Many SC2 specific channels on twitch and Youtube.

Quill18 and Arumba are the two I watch most for strategy games.