Microsoft Press is offering Introducing Microsoft SQL Server 2008 as a free e-book.

Introducing Microsoft SQL Server 2008:
Chapter 1: Security and Administration
Chapter 2: Performance
Chapter 3: Type System
Chapter 4: Programmability
Chapter 5: Storage
Chapter 6: Enhancements for High Availability
Chapter 7: Business Intelligence Enhancements

The link to the book is http://csna01.libredigital.com/?urss1q2we6