Microsoft's SQL Server Tutorial / Books Online Collection

Here is a summary list of BOL (Books Online) for SQL Server 2008 R2 and 2012. Hope it will help you to locate your resourses more quickly:)

SQL Server Books Online for SQL Server 2008 R2 covers the topic from data management to business intelligent solutions, including

• Database Engine
• Analysis Services - Multidimensional Data
• Analysis Services - Data Mining
• Integration Services
• Master Data Services
• Replication
• Reporting Services
• SharePoint Integration 
• Service Broker 

SQL Server Books Online for SQL Server 2012 includes

• Database Engine  
• Data Quality Services
• Analysis Services 
• Integration Services 
• Master Data Services 
• Replication  
• Reporting Services   

Note that the major changes for SQL Server 2012 are addition of DQS and removal of Sharepoint integration. DQS is a knowledge-driven data cleansing solution that can be used together with SSIS and MDS.

On the other side, SQL Server Developer Reference will give you more tutorials to explore. It is available online at MSDN and TechNet. 

If you still feel that is not enough, go to Microsoft's learning center for more. Don't forget to click tabs to choose the right version among four available versions: 2012, 2008R2, 2008, and 2005. This site provides combination of TechNet and MSDN resources.