CHAPTER 8
The primary source for information on Unity should be the Discussions page on the Unity home page at CodePlex. Before you ask a question or ask for a new functionality, make sure nobody has already done so first.
Then there is the Issues page. On this page you can see bug reports, track their progress, and maybe even raise your own issues.
The Class Library reference is available on Microsoft’s web site.
The patterns & practices group has two e-books freely available on their web site: Dependency Injection with Unity only covers version 2 but the Developer’s Guide to Microsoft Unity already covers version 3. You can also get Dependency Injection with Unity in hard copy from your favorite store.
Microsoft published some sample quick start code on their web site. Have a look at the samples and see if they can help.
Stack Overflow keeps track of questions related to Unity under the tag “unity”.
I myself blog about Unity occasionally and all posts are tagged “unity” as well.