Finally, let's see where we can find more information about the Yii framework, as well as its community.
The framework website is, quite simply, the number one place to read more about Yii. Its URL is http://www.yiiframework.com. As with any software tool, the API documentation section will be invaluable as you work through your development. The forums provide an excellent resource for getting help with specific issues you run into. There are a number of tutorials, as well as a wiki with examples to look at. The best outside resources are listed on the website as well, so this should absolutely be your first stop.
The Yii API documentation is probably the most beautiful and easy to use documentation ever published on the World Wide Web. The URL is http://www.yiiframework.com/doc/api/. If you are going to seriously use Yii, you definitely should add it to your bookmarks, because you'll need it a lot.
The Yii website has a number of tutorials that are excellent. One of the best resources beyond the API itself is the Definitive Guide found at http://www.yiiframework.com/doc/guide/. This guide is very thorough, covers all the important topics, and has a lot of important tips and code samples packed in.
The blog demo we based the book on is discussed in great length in the tutorials section of the Yii website. The URL is http://www.yiiframework.com/doc/blog/.
The wiki holds a lot of independent examples and code snippets that should come in handy (http://www.yiiframework.com/wiki/).
If you can't find an example of what you're trying to do in the wiki, the forums are also a great resource to search for previously solved solutions to problems. With Yii's popularity on the rise, the forums are increasingly active. This is an excellent place to get your questions answered.
One of the most comprehensive tutorials for Yii was done by Larry Ullman. He has written an excellent book on Yii, and has chosen to release much of the content publicly on his website http://www.larryullman.com/series/learning-the-yii-framework/.
There's another set of excellent screencasts produced by Jeffrey Winesett to help you get started at http://www.yiiframework.com/screencasts/
Yii has even entered the Facebook world with a group for everything Yii-related (https://www.facebook.com/groups/61355672149/).
At the time of writing, there were several thousands of members.