Learning Unity

This page serves as a list of resources and tutorials for learning Unity

Introductory overview of Unity
If you open Unity and are not really sure what's going on, check out this video that covers all of the interface and basic concepts:

http://unity3d.com/learn/tutorials/modules/beginner/live-training-archive/editor-basics

Furthermore, here's an explanation video of what GameObjects are:

http://unity3d.com/learn/tutorials/modules/beginner/live-training-archive/gameobjects

Lynda.com
Get a 7 day trial (or go to the library as I believe there is free access to it there) and do the following tutorials:

Unity 2D Essential Training - http://www.lynda.com/Unity-2D-tutorials/Unity-2D-Essential-Training/159243-2.html

Creating Mobile Games With Unity - http://www.lynda.com/Unity-tutorials/Creating-Mobile-Games-Unity/171054-2.html

If you know Java already do this tutorial: Up and Running with C# - http://www.lynda.com/C-tutorials/Up-Running-C/164452-2.html

If you have little to no experience in Java do this one: C# Essential Training http://www.lynda.com/Visual-Studio-2010-tutorials/C-Essential-Training/83789-2.html

Other free tutorials
Runner, a minimal side-scroller - http://catlikecoding.com/unity/tutorials/runner/ (After you finish the tutorial try to add a coin that increases score, a different type of power up and anything else you can think of)

Complete the official Unity 2D lessons and the assignment - http://unity3d.com/learn/tutorials/modules/beginner/2d

Game Institute
Really good tutorials but it costs $49 for a year but covers a lot more than just Unity including C++, 3D Modelling and Animation and maths needed for game dev.

http://www.gameinstitute.com/unity-tutorials.php

Books
Build a 2D Platformer in Unity by Jesse Freeman - http://jessefreeman.com/learn-build-platformer-unity-2d/

Same guy that does the 2D Lynda.com tutorial, most of the book's content is available free via his mailing list. His website contains some other useful stuff.

Documentation
Official Unity documentation is available here - http://unity3d.com/learn/documentation

Unity also has their own version of Stack Overflow dedicated to the engine here - http://answers.unity3d.com/