Hi Getviewsnow,
While my opinion is obviously biased, I do have a book being published in the next couple of months titled "The Complete XNA 3.0: An Exploration into the XNA Framework Library."
The book is an in-depth survey of everything you can and cannot do with XNA 3.0 on the PC, Xbox 360, and Zune, and focuses on exploration through experimentation. Over the course of the book readers will work with every major class in the XNA Framework Library, will write dozens of small spikes, and will implement 20 chapter projects - each which builds onto previous projects to create a 3D maze game for the PC and Xbox 360, and a 2D maze game for the Zune.
With that being said, it is not a book about game programming. That is, rather than teach you how to build a home, it teaches you how to use the tools to do so. As a result, there's no chapters specifcially focused on terrain rendering for example, however there are chapters focused on beginning, intermediate, and advanced rendering techniques, as well as particles and other special effects. Similarly, there is a chapter which teaches you how to work with the building blocks of 3D models, as well as a chapter on actually loading and animating skinned models. So if you follow along you'll have everything you need to use XNA to create a terrain renderer.
As an aside, I'm running an online guided workshop beginning March 30th specifically on XNA 3.0. The workshop doesn't cost anything to participate and gives people interested in thoroughly learning XNA a chance to work with thousands of other people, side-by-side, to master this powerful API. If you want more information on either the book or the workshop, follow the links below. Cheers and Good luck!
The Complete XNA 3.0
The GameDev.net XNA Workshop
