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There is a massive amount of Blender tutorials on Youtube, but the quality of those videos varies dramatically.
In this thread I want to collect all the good and useful tutorials.

Awesome Blender Youtube channels:
Blender Guru
Blender Cookie
CG Geek
Gleb Alexandrov
Cynicat Pro
Oliver Villar
Agenzas Brothers
BlenderForNoobs
CG Masters
Sardi Pax
Blender Sensei

Beginner tutorials:
Learn Blender in 1 hour
Blender Basics - Interface and navigation
Blender Basics - Modeling
Blender Basics - Animation
Blender Basics - Shading and Lighting
Create a lightsaber
Blender Cycles Tutorial - Lights!
Sculpting in Blender
Blender 3D: Basics recap
Essential Modeling Skills - Basic Operators - Part 1

Advanced tutorials:
Advanced Facial Animation Techniques (Danny Trejo never looked prettier)
Balloons Simulation with rigid bodies
Battle Scene Tutorial
Physically Based Shading - Building Shading
Modeling Stones with Displacement Modifier
Create a Volcano Eruption
Create Gorgeous Waterfalls in Blender
How to render fire in Cycles
Why the Bevel Tool is awesome

To be continued...