目前为止，unity3d相关学习资料还不是很多，不过已经是在快速增长中，下面列出的是一些国外unity3d学习资源，聊胜于无。

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

Unity Tutorials on reddit.com

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:

Unity Documentation

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 Resources

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:

Unity Blogs
Unity Videos on Vimeo
Unity Videos on YouTube

Community/3rd Party Provided
In addition to all the material above 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:

Unify Community Wiki

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

Unity Game Development Essentials (book)

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

http://www.learnmesilly.com/
http://unity-tutorials.com/
http://unitytutorials.com/
http://vimeo.com/channels/ncsuunity
http://vimeo.com/ryanzec
http://diamondtearz.org/lists/unity3d-scripting/
http://ethicalgames.wordpress.com/2009/07/04/the-unity-3d-tutorials-new-easier-to-find/