Get a free a ebook on an Introduction for IT Professionals to Windows 8 from here:

http://blogs.msdn.com/b/microsoft_press/archive/2012/11/13/free-ebook-introducing-windows-8-an-overview-for-it-professionals-final-edition.aspx

It’s available in PDF, Mobi (Kindle) and ePub formats.

Topics include:

• Performance, reliability, and security features

• Deployment options

• Windows Assessment and Deployment Kit

• Windows PowerShell™ 3.0 and Group Policy

• Managing and sideloading apps

• Internet Explorer® 10

• Virtualization, Client Hyper-V, and Microsoft Desktop Optimization Pack

• Recovery features