There are many free eBooks & resources available from Microsoft and members of the MVP community. This is a collection of several very useful free publications:
Power View Infrastructure Configuration and Installation
Link
Introducing Microsoft SQL Server 2012
PDF | EPUB | MOBI
Introducing Microsoft SQL Server 2008 R2
PDF | XPS
The Many-to-Many Revolution
Link
SQLBI Methodology
Link
Configure Kerberos Authentication for SharePoint 2010 Products
DOCX | PDF | EPUB | MOBI
Business continuity management for SharePoint Server 2010
PDF | EPUB | MOBI
Deployment guide for SharePoint Server 2010
PDF | EPUB | MOBI
Get started with SharePoint Server 2010
PDF | EPUB | MOBI
Governance guide for Microsoft SharePoint Server 2010
PDF | EPUB | MOBI
Profile synchronization guide for SharePoint Server 2010
PDF | EPUB | MOBI
Remote BLOB storage for Microsoft SharePoint Server 2010
PDF | EPUB | MOBI
Technical reference for Microsoft SharePoint Server 2010
PDF | EPUB | MOBI
Upgrading to SharePoint Server 2010
PDF | EPUB | MOBI
Getting Started with SharePoint Server 2010
PDF | DOC | XPS | EPUB | MOBI
Planning guide for sites and solutions for Microsoft SharePoint Server 2010, Part 1
PDF | DOC | XPS
Planning guide for sites and solutions for Microsoft SharePoint Server 2010, Part 2
PDF | DOC | XPS
Planning guide for server farms and environments for Microsoft SharePoint Server 2010
PDF | XPS | DOC
Capacity planning for Microsoft SharePoint Server 2010
PDF | XPS | DOC
Most of these resources and many others can be found on Eric Ligman’s blog