Last month, Pearson(Sams Publishing) sent me a book to review. It's the 《Microsoft Dynamics CRM 4 Integration Unleashed》written by Marc and Rajya.
The book covers many areas that you can think of about the CRM 4 integration: Infrastructure Design; Extending CRM; Silverlight Integration; SharePoint Integration; BI; Digital Phone Integration; Master Data Management; Social Network Integration; Mapping Technologies; CRM 4.0 Accelerators; SCOM; VSTS; BizTalk Integration; Azure; Scribe Integration and more.
I really like the fact that the book provides some real world examples and step by step through integrating Dynamics CRM with other products/technologies, it's helpful for CRM architects and developers to get an overview or even in details about CRM Integration.