Unity Technologies Provided
Unity Technologies provides some valuable learning material for you right out of the box by way of the product documentation. That documentation is installed with Unity and Unity iPhone, or it can be found online at the following URL:

Note: as of today the Unity iPhone documentation is only available by installing Unity iPhone itself.

Unity Technologies also provides some additional learning material in the Resources area of our website. These include tutorials, example projects, videos of all sorts, sample assets and more. All of that is available for free and is available at the following URL:

Unity Technologies also maintains our company blogs, and in many posts we include videos that can often include valuable material for you to consider. You can read our blogs, and find our videos at the following URLs:

3rd Party/Community Provided
In addition to all the material above there are 3rd party companies providing learning material about Unity. In particular, Noesis Interactive is providing courseware for Unity:

(video based)

And of course the community itself is an extremely valuable source of information. Members of the community help maintain the community wiki, one has written a book and many others maintain their own tutorial sites, all are worth checking out. The Unify Community Wiki can be found here:

Information about Will Goldstone's book about Unity development can be found here:

(book)

And you can find 3rd party forums and tutorial materials at the following URLs:

Here are a pair of YouTube playlists with a huge number of videos available for you to learn from:

Reddit.com: Unity Tutorials
We're maintaining a reddit.com page for Unity Tutorial materials and websites:

If you maintain or know of any learning resources that are not listed above that you think should be included in this post then please send a private message to me (HiggyB) and let me know so I can update this post, thanks!
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Tom Higgins - Product Evangelist at Unity Technologies ApS
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welcome to unity club:http://www.narkii.com/club/forum-51-1.html(纳金网unity3D论坛，资源丰富，业者齐聚。)