Many of the SQL Server 2005 books are still in the works and haven't hit the major book retailers yet. I look forward to reviewing the many more that will focus on individual new components of SQL Server 2005(ie. SSIS, Service Broker, XML, Reporting Services, Analysis Services, etc.).
So far, my favorite SQL Server 2005 book is Pro SQL Server 2005. This book is written by a bunch of guys who have been working with SQL Server 2005 for the last few years. I also liked the fact that I got one of the first copies and was able to download the fully searchable eBook.
SQLDiva