Are you busy with your work, traveling and personal live like I am and you want to get started with Windows Server 2008 than check out this eBook?  I personally like the writing style from Realtime Nexus authors and their concept of writing eBooks.  This "The Definitive Guide to Building a Windows Server 2008 Infrastructure" eBook has 10 chapters and first chapter is available for download. PDF document with 32 pages which is easy to read and maybe schedule 2 hours to read it through.

Register your account on their website and download the pdf file.

Chapter 1: Introduction to Windows Server 2008
Chapter 2: Server Manager
Chapter 3: Active Directory Design & Domain Controller Management
Chapter 4: File Servers & Storage Management
Chapter 5: Server Core
Chapter 6: Managing & Customizing Group Policy
Chapter 7: Introduction to Terminal Services
Chapter 8: Advanced Topics in Terminal Services
Chapter 9: Securing Servers & the Domain
Chapter 10: Windows Failover Clustering